This is an excellent location and Martin is a very friendly and helpful host. He was flexible about my arrival time and very responsive. He returns texts in a very timely manner and is quite easy to communicate with.
As the ad says, it is very narrow and steep steps up to the apartment. The room your stay in does not lock separately from the rest of the house. There was no evidence that Martin or his cleaning lady ever came into my room and I trust that they did not. Martin seems to be the trustworthy type so I had no issues leaving behind my possessions, but I could see this being an issue for some travelers.
As mentioned in other reviews, the place does smell of cigarette smoke. Mostly in the halls and not nearly as bad in the bedroom or kitchen. Avoid this place if you are sensitive to cigarette smoke. I line dried many of my clothes after washing them and they did NOT end up smelling like smoke, so I given the smoke level 3/10.
Martin is GREAT! His place is a nice place.