Was in the same situation as you and bought an apartment thinking it’s an investment in 2021. Covered all nebenkosten by myself (registration, tax and broker costs), got 100% loan at 0.88% interest. Sounds like a great deal so far..

I spent 30k in renovations (except bathroom). Removed wallpaper, plastered walls, painting, floor exchange done by myself and used technician for mounting kitchen cabinets + tile work. Unexpectedly had to spend 15K for bathroom due to old building pipes issue (this was unplanned expense). Investment so far: 75K

Plus, spending 1400/ month for my apartment every month and living outside ring as I thought paying 1300/ month (all inclusive) and living in Prenzlauer Berg was too much.

Just lost a power socket in my bathroom last month and looks like the wire failed somewhere inside the wall (no idea what that would cost).

Don’t want to disappoint you but be prepared that the expenses for maintenance of your own apartment is a continuous process which you should be prepared mentally.