I have mixed feelings.
David was a really nice person, and all communication with him was easy - he speaks good English and his emails had all necessary info. The place is a single room studio, as described, and obviously a lot of thought has gone into getting the most out of the 12 square meters.
Upon entering the room, however, the first thing that caught my attention was a strong mouldy smell, even though the window was open. It was like entering an earth-floored cellar. To me the smell was so strong that there was no question of closing the window, and I certainly did not want to spend time in the room. It is a first floor apartment, so people walk right past the window and there is traffic. As a result of the smell and the noise due to open window, I slept really badly. We had booked for three nights, but I reserved a hotel room for the remaining two nights, and we moved out.
David refunded one third of the price, which was nice of him, so we only paid for one extra night.
As a final note I should say that my wife said she could have stayed at David's place for all three nights.