The apartment is in a great location (near to the underground, cafes, and museums, and is clean. Unfortunately, these are the only advantages of this place. Martin never says about all the rules you should follow living in his apartment. Firstly, you pay a fee for a cleaning service. Then he sees a little spot on the floor and makes you clean it, reaching out to you with a rag and staring at you while you clean the floor (!). It is absolutely offensive and rude. If you get extra money from your guests for this service, don't be nasty. Secondly, he publishes pictures of the bathroom/balcony as if you have full access to it, but it is not true. You cannot use more towels as there are only two towels per person, however, he never reminds you that you are not allowed to do so and never says in advance about the extra money you should pay for it. The balcony is unreachable as you have to go through his room to get there.
Martin behaves trickily, asking if you need info about check-out details but never writes it down or says out loud. 24/7 Internet access is not always available for tourists, so I got no idea at which exact time I should leave in the morning. As a result, I checked-out one hour later than he claimed and he had a hysteria, breaking into the room without knocking. On the morning of the first day of stay, he got in without permission when I was sleeping, stood for a couple of minutes, staring at my back, and just went out. It is not private to live in such conditions.
I was also allergic to the feather blanket on my bed and dust all over the bookshelves because there are a lot of old books in the room. A good host should remind visitors about such things in advance.