Unable to answer "What type of bicycle rental is this?" – aspern Seestadt - E-Bike Bakfiets CargoTrike (Bicycle Rental) – https://osm.org/node/11334790041 via StreetComplete 57.0-beta1:

Das sind nur Fahrradabstellplätze

Attached photo(s):
https://westnordost.de/p/197988.jpg