All around a great stay, both Sebastian and Marlene have been very hospitable and friendly. We had a good chat and I got a bunch of recommendations for places to explore exactly as I wanted.
Good location too, only a few minutes walking from Volkstheater U-bahn station, there's a shop around the corner and a bunch of good cafés in the neighbourhood.
As is indicated in the description, there's a dog in the apartment and while I didn't get to see a lot of the old lady, the few interactions we had she's been very sweet and gentle. Also fluffy and soft ❤️.
I guess there're only two extra things worth mentioning: The window in the room you're staying in is facing a street. Which isn't busy, but sometimes heavy cars come through and might wake you up, especially on the weekdays. The other thing is also relevant mostly for light sleepers - the bed is a unfolded couch (at least as far as I could tell?), so this means there are a few small cracks on the bed. Wasn't a problem for me though