We had a lovely time when staying in Mariano's apartment in Madrid. He is a gracious and extremely pleasant host as well as very helpful with his suggestions on where to visit and eat. The flat itself was beautiful, clean and very comfortable and provided with all manner of conveniences that really made our stay great. The flat is well located close to a metro station (maybe 2-3 minutes walking) as well within easy walking distance to most of the places we wanted to visit! :)