Ok, we came to Berlin for three weeks and found this little apartment.
If you are looking for a great location, with all needed shops , necessities, restaurants and easy access to the public transportation system, then this place is for you.
The apartment is sparsely furnished and we used both the futon and the bed, because one was too small for both of us, since we are used to a king sized bed.
The kitchen provides a small microwave, a one burner induction stove (so just small meal preparation is possible), a decent fridge, coffee maker and water heater. The glass dishes are somewhat basic and there was no can opener to be found.
There is a tiny washer (by US standards), though no dryer.
The bathroom is decent with a tub and shower.
The living room provides the futon, a small TV and the desk (essentially what one sees in the pics!)
With summer coming it will get pretty warm in the apartment, since there are no fans nor A/C.
Overall we were very satisfied with our stay and with the host, who had left extra towels and sheets since we stayed much longer than the average guest.