Lucrecia is a good host. She will help you quickly when you need it and I had a very nice stay in the flat in the basement of her house. Alcobendas is 20 mins by metro and only a little more time to get into town. The metro station is like 3 minutes walking distance and there is a food store and a cafe nearby as well. I recommend the flat itself although Tres Olivos doesn't really have anything to offer.