Stayed here for a month before moving to Berlin and I had an amazing time! The room is very big and bright, there's space to work and space to chill, plus a (private) balcony to get fresh air (also there's a huge plant, which always feels nice!). The appartement overall also has a cool mood, if like me you prefer a more old school room layout to big open spaces. There's an inner courtyard to store your bike. Nitya wasn't there during the time I stayed, so we didn't meet personally, but communication was always really quick and she seemed very nice.
Friedrichshain is a cool area of Berlin, even though thanks to Corona I couldn't really enjoy most of the usual "attractions"... Still, you're only a 15min walk away from Friedrichshain proper where there are lots of nice shops and cafes. For public transport you're fairly close to Warschauer Strasse (S Bahn, Tram and usually also U bahn although there currently is a bus replacement service).
Overall this is a great choice for long (or short) stays where you can live your everyday life while being in a really nice location in Berlin.