I really enjoy the location of Heidi's place. It's close to a nice canal and also two breakfast places are at 1 minute walking distance. A bit further you'll have the choice of restaurants in many cuisines. The whole area is basically super nice to walk around. Also Tempelhof is relatively close. I even walked to mitte in one+ hour - the Museum Insel is very nice to visit. But also you can take the electric steps or PB.
The room is basic (bed, chair, mirror) but good. I prepared my owm 'meals' a few times, which is possible, but not very cosy to eat it in your room. It's perfect if you don't need to be much in your room and be out a lot and explore Berlin.
Heidi is as mentioned a lot in the reviews, very friendly. Thank you again!