Great flat - clean, spacious, private entrance. Very comfortable! Almost too comfortable - definitely hung out inside more than expected, vs venturing out into the cold and rain.
I was traveling solo, so sleeping situation was fine - but no proper beds fyi - just 3 fold down sofa beds in 1 big room. So best for a couple or a family with small kids. Pretty comfy though.
Neighborhood is safe, if a little dead - not much to see in the immediate vicinity, so best if you like to walk / don't mind traveling to and from what you wanna see + do via subway. Seems like a good example of a typical Berliner neighborhood though.
Late night food and beer spot nearby so thats convenient. And getting in was easy, got the keys from a lock box on a nearby bike. Door lock is a little sticky, so get the hang of it before coming and going to avoid worry.
Alex was easy to contact and answered all questions.
Overall very good experience!