This is a top-notch AirBnB and is basically like staying in a really nice hotel, except that you share the flat with other AirBnB guests (two other rooms are let out). The set-up, linens, furniture and everything in the flat is fantastic. The location is excellent, in close proximity to lots of things to do and see yet on a very quiet street.
I wasn't able to meet Miriam in person, because I arrived when she was at work, but she made all the appropriate arrangements for me to find and get into the flat without any trouble.
This is one of the best AirBnBs I have stayed in, and the only caveat is that I would have preferred to stay in a flat where there is actually a Madrid resident rather than just other tourists.