I had a good time at Mirna's and David's and since there are not many comments yet, I thought I would go into a little detail.
The check-in / check out process and the communication are excellent, the hosts are very responsive.
The apartment is on the ground floor. It doesn't get a lot of light because the two windows face a courtyard, but on the plus side, it's very private.
The whole apartment is very clean. The bathroom is very big, there is a bathtub (though, unless I didn't crack the code, it's not possible to take a bath) and the hosts provide toilet paper, towels and soap (although I bought my own because I thought it was not the best quality).
The kitchen is very well equipped. You can eat on the bedside table but that there are no chairs.
Theres a big space to hang clothes and store your luggage and the bed is very confortable.
The location is very cute and quaint, with very nice cafes and walks, but be ready to travel 45 minutes to 1h to go to the center of Berlin.