We had a nightmare experience trying to check in after a 12 hour flight from South America. Cesar decided to change the check in plan and sent a message via airbnb 2 hours before check in which we did not get. We checked the airbnb site at the airport after arriving at 7am and since there was no change, we made arrangements to store our luggage with bagbnb and be out and about in Madrid until check in. If we don't confirm the change of plan, it means we did not get the message so Cesar should have made sure. The single most important thing an Airbnb host needs to do is get the guest access to the property. If they can't do that then the rest is pointless. I had told him we were arriving on an overnight flight and had 2 small children. We were stuck wandering the streets looking for a way to contact him and/or find a hotel. After we got the message of the change of plan, he never checked back or apologized for the lack of due care, just some nonsense about kicking the previous guest out early just for us. Anyway, we finally got in after picking up the key at a local restaurant and found the loft bed area had not been cleaned/turned over. He never responded about that. There were some minor cleanliness issues in the kitchen but it would have been fine if we had had a better experience with the host.
Apart from that! .... The best thing about the apt is the location. It's a quiet neighborhood but full of places to eat and buy provisions, and right next to Atocha. It is a small studio so cooking inside quickly makes the place quite warm and there is no a/c.
My feeling about the host is that he runs more than one airbnb and this shows in his attention to detail compared to other experiences I have had.