We didn't get to interact much with Luis, but Fernando was there accommodating all our needs. We arrived earlier than the check-in time, but the hosts were flexible and offered us earlier check-in. In terms of communication, everything was great - we talked over WhatsApp, and Fernando was really responsive whenever we needed him.
The place was exactly what is described - really spacious apartment, that can easily fit 6-8 people. The rooms were big, with comfortable beds, and the living room is very nice, and good place to relax in the hot summer days. There are two air conditioners, one in the kitchen, and one in the living room, which is enough to keep the whole apartment cool. The two bathrooms were enough for the five of us. The only problem was that there is only one boiler, so we struggled when we needed hot water for showering. Also there was only one set of keys available, which, for larger groups, is a bit of inconvenience. The location is good - walking distance from almost everything in the city, and the area is not too busy, which is good.
Overall, the place is exactly what we expected and is worth the money, especially for bigger groups.