I booked this hotel through Venere based on location and price (and the reviews there & on Tripadvisor sounding OK, of course !). The price was €88 pn for a standard double – not quite such a bargain when I discovered it didn't include breakfast (which was €10 pppd extra), but still reasonable value I think. It bills itself as 4* but I'd say it is 3* and resembles a mid-priced chain hotel. The room & bathroom were both quite adequate and clean. The location was very good – walking distance to most of the Mitte sights, restaurants, etc; but also very close to the Stadtmitte underground station which has 2 lines serving lots of other places.
We probably wouldn't stay there again, though, due to the unhelpfulness of the staff we encountered. The one time we tried the breakfast the woman on duty seemed positively hostile, and propped open the door on to the street 15 minutes before the official end-time for breakfast (in March !!) to try to get rid of us. And when I came to pay the bill the receptionist said there was a problem with my debit card (which I'd been using elsewhere throughout our stay), I phoned my bank and found an authorisation request hadn't even been received, the receptionist continued to insist it was my problem until I gave in & went out to get cash from an ATM to pay the bill (as we had a flight to catch). I had suggested paying by international transfer when I got home (which I've done once before when a hotel's POS equipment wasn't working), but got the impression that she wasn't going to let us leave the hotel without paying.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC