We had a lovely stay in Andreas' loft in Hermsdorf. We were welcomed by his whole family. They live downstairs and are readily available for any questions.
We requested a second pair of keys and they were issued immediately.
The living/kitchen is very spacious. The cabinets were filled with practical basics, like coffee, tea, cereal, oil, salt & pepper, so you don't need to shop for those.
The surroundings are quiet, residential, and you can travel with the S-bahn into the city center. The station is just around the corner. There are lots of facilities around the station (supermarket, bakery, coffeshop, apotheker, drugstore, pizzeria).
We rented e-bikes at a shop in Tegel (they have regular ones too) that were helpful in getting around at night.
We would happily return to this address.