Levan's apartment in Brückestraße is housed in the 2nd F (third level) of an old building near S Bahn and 2 U Bahn lines. The location and its spacious unit are about as good as it gets.
The check-in is terrible, we have informed check in time but still need to call local number (not a great idea if you are a visitor with no local SIM).
We have 8 beds but 2 of them are totally useless and they are sunk right in the middle (most probably due to age or overused).
Internet is practically hopeless. It is most often disconnected, and in rare cases they are connected, they are slower than slow.
We are staying for 4 nights and there is no litter collection arranged in any of the days we are staying. Which is terrible considering we are a traveling group of 8 people.
Overall, this is an overpriced option for a mediocre apartment. Should look somewhere else if considering a stay in Berlin.