5/5 would recommend staying at Martin’s apartment. The location is perfect for seeing Berlin, within walking distance to all the major public transportation hubs. And plenty of activities to get yourself lost in just in the immediate vicinity.
The apartment itself is very spacious with all
the amenities you could ask for. And Martin is quick with communication and offers friendly advice on things to do and how everything works.
Would diffidently stay again whenever I find myself in Berlin!