I stayed 2 nights at Rosi's.
She's very friendly and she accepted that I bring my luggage beforehand and I could also let it until I had to go back to the airport.
Her flat is very nice, I especially loved her terrace, so cute !
The bed was very comfortable, better than mine (I need you to find the mattress ref ;) ).
She has 2 cats and a dog, each with their own personnality of course, but friendly too :)
The flat is in a great location: nearby you have the Sociedad General de Autores y Editores with a very particular achitecture !
I did everything by foot but the metro station is at 100m from the flat.
When I was there there were other airbnb travelers in the flat.
NB: the toilets are in the bathroom.
Rosi gave me good tips about visiting Madrid.
I think 3 days to visit Madrid is a bit short but I fell in love with it !