The location is excellent, a short walk to the U bahn and then 3 stops to Alexanderplatz (a main transport hub in the centre).
The apartment itself was fine for what we wanted and good value (we were hardly ever there), rather faded with uncomfortable and torn seating, limited crockery and a slight drain smell and a terrible mattress so we both had bad backs after 3 nights.
The checking in was fine, although Trudy's explanation of how to get there caused confusion and it would have been easier if we had relied on ourselves to work it out rather than follow her instructions. The 'housekeeper' (we were never given a name) met us and told us the necessary but it wasn't like any of our other airbnb bookings with a friendly greeting and lots of local info, instead no introduction, the basics and gone never to hear from her again - not a problem but it felt more like a dodgy landlord than an airbnb host.
Again, not so important but the communal stairwell was in a dreadful state; stair rods hanging down torn carpets, dodgy lighting etc., normally beyond the host's control, but we understood the whole building to be Trudy's.