Unable to answer "Do you have to pay to use this restroom?" for way/245173890 via StreetComplete 38.2:

It is only for the renters of the grill hut and you need a key to access it

Unable to answer "What is the house number of this building?" for way/843092827 via StreetComplete 28.0:

it's a garage

There is a house missing here, number 31.

via StreetComplete 38.2

alla-Hopp Fitnessanlage für Jung und Alt (seit Sept. 2016) (OSM data version: 2017-01-19T15:17:02Z) #mapsme

Same here: Strasse nicht erreichbar/verlassbar. Auf dem Luftbild lassen sich zwei parkende Kfz erkennen.

Landbäckerei Mayer ist geschlossen; demnächst soll hier ein Fischrestaurant eröffnet werden.

Wilhelmsplatz

There's a barrier between Way: 34472886 (public track) and Way: 34472887 (private track). Basically this is a dead end if you don't want to climb over fences or walk along across country. I took photos of this place if that helps.

Site#2