We really enjoyed our time staying in this little flat in the quiet end of Prenzlauerberg.
The flat is as described, small but adequate for two people to sleep in. Be aware, there are four flights of stairs to walk up to get to it. An effort with heavy suitcases! The flat was light and airy. The kitchen is more a kitchenette, but there are plenty of fantastic restaurants just on the door step to keep you out of the kitchen. We prepared breakfast at home most days and very little else. There is no laundry, the closest we found was 10 minutes walk away.
We took full advantage of being less than a five minutes' walk away from the fantastic Friedrichschain Park. It is perfect for walking or running, with one of Berlin's few hills (a destroyed anti-aircraft tower from WWII). It's also full of playgrounds for children, and there are another three within about two minutes walk from the flat. There are a number of tram lines within 10 minutes walk, but for longer distances you will need to travel to transfer to the S or U bahn. Public transport is frequent and reliable in Berlin, so we didn't find that a problem.
I would recommend this flat for couples or singles who want to stay in a charming part of the city, outside of the tourist hubbub.
I will make one note for those sensitive to light while sleeping: the bedroom blinds do provide privacy, but do not block any light. No late sleep ins here!