The apartment was very clean and tidy, with good wifi, a hairdryer etc. The 2 single beds were really comfy (we didn't need the sofa bed). Duc Son was a great host, he lives in another part of the building the so greeted us at the entrance and showed us up to the apartment. He messaged us the day before with the check in details. The tram is right outside the building so super easy to get to any part of the city, using trains as well. It took about half an hour to get all the way over to the Friedrichshain-Kreuzberg side of town.
There are also lots of nice cafes nearby, walkable, and some great vegan places. Chaostheorie, Pizzare, Vego Foodworld and Cafe Neue Liebe were all great.
It's in the perfect location to visit the Mauerpark flea market on a Sunday. Bonanza coffee is nearby too and The Barn Roastery is only 2 tram stops away.
We had a really good stay, I'd definitely stay there again.