The apartment is nice and Nelson made an early check-in possible, which was very much apprechiated.
I would however not consider to book it in the wintertime again. There are two electric heaters in the apartment which only work while someone is in the apartment so it took a while for the apartment to warm up. It was cold and the beds felt a little damp when we arrived. After freezing for the first evening and the first night, I asked Nelson if it was possible to keep the heaters running while we were out, so we wouldn't always come home to a cold house. His short response was, that this was not possible and that he had never had any complaints about the cold before.
This was not exactly what I would consider a helpful response to be honest. We ended up buying a fan heater ourself because we didn't feel like either staying home all day for the heaters to have a chance to warm up the place (thick, cold stone walls and tiles unfortunately need quite a while to warm up if not constantly warmed) or keep freezing for the whole duration of our stay.