diff --git a/sartorius_logger/__init__.py b/sartorius_logger/__init__.py
index 11a5d59..6e954ca 100644
--- a/sartorius_logger/__init__.py
+++ b/sartorius_logger/__init__.py
@@ -19,6 +19,7 @@ from .parsers import parse_cli_arguments, parse_gui_arguments
 try:
     from gooey import Gooey
 except ImportError as exc:
+
     def Gooey(*args, **kargs):
         msg = "The graphilcal user interface must be installed separately"
         raise NotImplementedError(msg)
@@ -88,20 +89,29 @@ def _measure_and_log(nr, conn, logger):
 
 
 def no_progress_bar(iterator):
-    """" as stub function for not displaying a progress bar """
+    """" a stub function for not displaying a progress bar """
     return iterator
 
-def gui_progress_factory(settings):
-    """" as stub function for not displaying a progress bar """
+
+def gooey_progress_factory(settings):
+    """" progress information, tailored to Gooey """
     total = settings.measurements
-    print(f"measuring every {settings.interval.value}{settings.interval.unit} for {settings.duration.value}{settings.duration.unit}")
+    print(
+        (
+            f"measuring every {settings.interval.value}{settings.interval.unit} "
+            f"for {settings.duration.value}{settings.duration.unit}"
+        )
+    )
+
     def gui_progress(iterator):
         for i in iterator:
             print(f"measurement {i} of {total}")
             yield i
         print(f"measurement {total} of {total}")
+
     return gui_progress
 
+
 def _get_log_file_path(settings):
     """ constructs the path to the log file """
 
@@ -187,15 +197,16 @@ def cli():
     )
     export_as_excel(result)
 
-@Gooey(program_name="SartoriusLogger",
-    progress_regex="^measurement (?P<current>\d+) of (?P<total>\d+)",
-       progress_expr="current / total * 100"
 
-       )
+@Gooey(
+    program_name="SartoriusLogger",
+    progress_regex="^measurement (?P<current>\d+) of (?P<total>\d+)",
+    progress_expr="current / total * 100",
+)
 def gui():
     settings = parse_gui_arguments()
     log_file_path = _get_log_file_path(settings)
-    gpb = gui_progress_factory(settings)
+    gpb = gooey_progress_factory(settings)
     result = measure_series(
         settings, progress_bar=gpb, data_logger=DataLogger(log_file_path)
     )
diff --git a/sartorius_logger/parsers.py b/sartorius_logger/parsers.py
index 51088e2..e29e5e4 100644
--- a/sartorius_logger/parsers.py
+++ b/sartorius_logger/parsers.py
@@ -54,7 +54,9 @@ def parse_cli_arguments():
 
 def parse_gui_arguments():
     from gooey import GooeyParser
+
     """ parses command line interface arguments """
+    desktop_path = Path.home() / "Desktop"
     parser = GooeyParser(
         description="Make time series measurements with a Sartorius scale.",
         epilog=(
@@ -63,10 +65,36 @@ def parse_gui_arguments():
             "A relative directory path starts at the Desktop."
         ),
     )
-    parser.add_argument("port", nargs="?", default="COM4", metavar="COMPORT", help="Serial Port that connects the Scale, defaults to 'COM4'")
-    parser.add_argument("-d", "--duration", nargs="?", default="30m", help="Measurement duration, e.g. 10s, 30m, 2h")
-    parser.add_argument("-i", "--interval", nargs="?", default="10s", help="Measurement interval, e.g. 5s, 1m, 1h")
-    parser.add_argument("-o", "--output", nargs="?", metavar="DIRECTORY", widget='DirChooser', help="Select Output Directory, defaults to 'Desktop'")
+    parser.add_argument(
+        "port",
+        nargs="?",
+        default="COM4",
+        metavar="COMPORT",
+        help="Serial Port that connects the Scale, defaults to 'COM4'",
+    )
+    parser.add_argument(
+        "-d",
+        "--duration",
+        nargs="?",
+        default="30m",
+        help="Measurement duration, e.g. 10s, 30m, 2h",
+    )
+    parser.add_argument(
+        "-i",
+        "--interval",
+        nargs="?",
+        default="10s",
+        help="Measurement interval, e.g. 5s, 1m, 1h",
+    )
+    parser.add_argument(
+        "-o",
+        "--output",
+        nargs="?",
+        metavar="DIRECTORY",
+        widget="DirChooser",
+        help="Select Output Directory, defaults to 'Desktop'",
+        gooey_options={"default_path": str(desktop_path)},
+    )
     raw_arguments = parser.parse_args()
     return _normalize_cli_arguments(raw_arguments)
 
@@ -91,11 +119,11 @@ def _normalize_cli_arguments(raw_arguments):
     # directory stuff
     dir_path = _check_output_directory_path(raw_arguments.output)
 
-    measurements = 1 + (
-        duration.seconds // interval.seconds
-    )
+    measurements = 1 + (duration.seconds // interval.seconds)
 
-    return Settings(duration, interval, dir_path, raw_arguments.port, measurements)
+    return Settings(
+        duration, interval, dir_path, raw_arguments.port, measurements
+    )
 
 
 def _check_output_directory_path(raw_path):
diff --git a/tests/test_sartorius_logger.py b/tests/test_sartorius_logger.py
index a93d029..efe8fb1 100644
--- a/tests/test_sartorius_logger.py
+++ b/tests/test_sartorius_logger.py
@@ -41,6 +41,7 @@ def test_get_scale_info(scale_fixture):
         "Software Version of Control Unit": "1.2.3",
     }
 
+
 def test_get_scale_info_with_timeout(scale_fixture):
     from sartorius_logger import get_scale_info
     from sartoriusb import CMD_INFO_SNR
@@ -269,7 +270,9 @@ def test_export_as_excel(mocker, settings_fixture, logger_fixture):
 
 
 def test_cli(mocker, settings_fixture):
-    mocker.patch("sartorius_logger.parse_cli_arguments", return_value=settings_fixture)
+    mocker.patch(
+        "sartorius_logger.parse_cli_arguments", return_value=settings_fixture
+    )
     mocker.patch("sartorius_logger.measure_series", return_value="Results")
     mocker.patch("sartorius_logger.export_as_excel")
 
@@ -283,7 +286,7 @@ def test_cli(mocker, settings_fixture):
     assert measure_series.call_count == 1
     print(measure_series.call_args)
     call_args, call_kargs = measure_series.call_args
-    assert call_args == (settings_fixture, )
+    assert call_args == (settings_fixture,)
     assert call_kargs["progress_bar"] == tqdm
     assert isinstance(call_kargs["data_logger"], DataLogger)
     assert export_as_excel.call_count == 1