I really enjoyed my 3+ week stay with André and Su. The room is very well located. It's in a central neighborhood that is full of shops, cafes, restaurants, galleries, and boutiques.
It was a pleasure getting to know André and Su. We spent numerous long evenings chatting in the living room and I learned a lot about Berlin in the process. I would definitely recommend this stay if you prefer active hosts that will give you a deeper understanding of the place your staying. If you're looking for complete privacy this might be a little hard because it's a small flat with 3 people (you included). The bedroom is definitely very private and isolated from the rest of the flat.
For remote workers, the desk in the bedroom doesn't have strong enough wifi when using a MacBook (the hosts said this was an issue specifically with MacBooks). They were very accommodating and let me use the living room for meetings, however, I also discovered that sitting in a chair next to the bedroom door also worked quite well.