I know others have said this, but Nicolas can be quite unpleasant.

We arrived over an hour late and lost his number so could not inform him (100% our fault, and we felt terrible). However, after at least 15 sincere apologies, he was still not at all gracious; he said our being late made him miss his museum entry, so we ended up paying $40 extra for his tickets to appease him. I think a host should avoid purchasing non-refundable tickets an hour after his guests are to arrive.
This all made things very awkward as he could see into our personal apartment through the large windows in the living room (there are no blinds to shut them either). It seems like he wants to watch the apartment, make sure lights are off when you leave, etc. (You can tell from his bio that he is not very considerate of guests’ use of the apartment.)
The bed is not very comfortable, and there were several gnats flying around the kitchen.
I will say that this is an incredible location, so this place may still be worth it if that is important to you. However, if you want a good relationship with your host, make sure not to do anything to get on his bad side.