Rob was very communicative throughout the process, making it clear through his communication that he was serious and responsible. He gave me various ways by which I could communicate with him if I had any questions. Since this was my first Airbnb experience, that put my mind at ease.
The room in which I stayed is definitely for one person only. It has all of the necessary amenities, including a private bathroom attached, but it is only large enough for one person. The bed is a twin. However, it was made clear to me that I should feel welcome to use other areas of the apartment (i.e. kitchen, living room, etc.).
For those who like upscale shopping (especially women), this is a great neighborhood. The street is a small, tree-lined street, and although busy, the apartment is in the back of the building, so street noise is not heard at all. Overall, the neighborhood is fairly exclusive, well located, and features some quaint bars and restaurants. It also felt safe whenever I was coming home late (around midnight). There is a Metro station just a couple of short blocks away, and getting a cab was never a problem.
The host, Rob, was very amicable, and through his thorough communication and detailed information, everything went smoothly. I did not get to meet the rest of the family, as they were out of town during my stay. Overall, this was a very positive experience, and I would definitely contact Rob about this space when visiting Madrid in the future.