For those who like Kreuzberg / Neuköln, this location is perfect. Great restaurants and nightlife are all around. The rest of Berlin is easily reachable via public transportation from Hermanplatz which is quite close.
There are 4 rooms rented to guests (max.), and there are 2 shared bathrooms which are very big and very clean (one for men, one for women), plus an additional toilet, so it doesn't feel too crowded. During a one week's stay, I only waited for the bathroom to become available once.
When we visited, a light bulb in the toilet didn't work, but the owner responded and fixed it very fast (within 24h).
Also, we didn't have to pay extra for towels or bed sheets, this seems to be an old house rule which doesn't apply anymore.
Gerne wieder! we would gladly come again!