This is a snug apartment at street level, but with the bedrooms well back from the street. There's a downstairs bedroom (one level below street) that is very quiet. In the other (on street level) I was awakened by someone striding around in heavy shoes on the level above.
Check in and check out is all remote. Francisco keeps in touch by phone, but to check in you have to go to a nearby pharmacy to get the keys. He said he wasn't even in Madrid at the time.
One of the small appliances (the one that heats water for tea and coffee) didn't work, and it seemed an unnecessary hassle to have to buy napkins and laundry detergent. These things are easy for the host to provide and a nuisance for the guest to buy.
As long as you set your expectations, this can be a comfortable place to base yourself to enjoy Madrid.