This is a lovely little basic apartment with real character and a cosy feel (this isn't a polite way of saying 'small', it's actually perfectly sized). We enjoyed our stay here and would not only stay again but recommend it to friends. A real find, and good value for money.
It's especially good to find an apartment with a bath as well as an over-bath shower - so welcome after a long day's sightseeing.
Well located for public transport, with tram stops outside. Although on a main road, it wasn't noisy at any time.

There's a Bio-Markt round the corner, and a couple of supermarkets about 5-10 mins walk up Prenzlauer Allee (be mindful that most German supermarkets are closed on Sundays!) A bakery opposite, and a coffee shop or two also.
Although we didn't get to meet the owner, he's super-responsive and helpful by text or email.
A few points worth noting:
- the apartment is on the first floor but, because of the arrangement of the building, it's up several flights of stairs.
- if you decide to cook or reheat food, bear in mind that (at the time of writing) there isn't a microwave and the saucepans are in poor condition. The cooker is electric and works well.
- as has been mentioned by another reviewer, the large double bed is quite soft and has a dip in the middle - good for snuggly couples. However, there's also a single sofa bed in case you need a firmer mattress.
- there's a hairdryer and iron, as well as a good selection of toiletries left by previous guests, in case you forget something
- at the time of writing, there's a Rough Guide To Berlin in the apartment
All in all, a really good place to stay if you're looking for somewhere relatively inexpensive - enjoy Berlin!