Sure, got the point. From my perspective there is no wall and access is from the street, there is no sign "private area"
I think if someone on a bike would like to take water and see this tap, he will just use it and map can be useful to present it. It is not main place with 1000 tourists so shouldn't affect local people

I was there, just travelling on bike and use it. It is let's say mostly for people living in this building but I believe they shouldn't be against to be used sometimes by someone riding on a bike in this not so popular area

Building Filmarska 19/1153 has water tap close to entrance to garrage. Visible on Google maps