I spent 3 weeks at Katha's as I just moved to Berlin and I needed a place to stay and to work for some time.
The bedroom is really spacious and is equipped with all the necessary furnitures one might need: a bed, a desk, a chest of drawers... Plus, it's super quiet at night (which is a dream for me who is noise sensitive).
The flat has good vibes and Katha's two children keep the place lively (and are an excellent alarm clock :)).
Katha was nice enough to lend me her bike so I could go for a tour of the lake (which is really enjoyable in this season).
The only downside was the Wifi which wasn't working well at times, so it was a little bit difficult to work and to call my clients and family.