Stayed here for about a month and a half and I highly recommend it for long term stays. The apartment is huge, has basically everything you could need for a comfortable living and its location is unbeatable - plenty of supermarkets around, metro station is 2 minutes away, walking distance to the first district, shopping street a few minutes away as well, and plenty of restaurants and cafés everywhere. Philipp was reachable via many various messengers and made the check-in/out process very easy.
Great value for money!