We stayed for a week at Carlos’s apartment and had an excellent stay. The apartment was as described, very clean and very quiet even though there was some construction going on at the lobby. There is 24 hour desk service and was very helpful by helping us out with directions and gave us a map of the major attractions. Metro Colon is just outside the corner and Cercanias just a block away for day trips outside Madrid. Excellent location and very safe which is a must for us. All the major attractions are just about 20 minutes walk and plenty of restaurants nearby. There’s even a supermarket that’s opened 24 hours if you need water and some snacks. We’d definitely stay there again!