Alternatives:
After arrival in Constance:
via the B33 from Singen / motorway, then turn into Gartenstraße at the bridge intersection
via the Meersburg–Constance car ferry, cross the Rhine bridge, follow Untere Laube, then turn into Gartenstraße
from Switzerland via Europastraße, turning into Gartenstraße at the bridge intersection

In Constance, there are designated residential parking zones that are reserved exclusively for residents. In addition, there are public managed parking spaces that require a fee but can sometimes be used free of charge on weekends and overnight.