Me and my sister had a lovely stay at Ramon's Apartment.
We ran late getting there but still had Ramon ever so patiently waiting for us to check in. He was incredibly helpful and was adamant to carry my sister's very heavy luggage up the four flights of stairs which we really appreciated!! Upon entering the home, Ramon was very welcoming and gave us a quick tour as well as describing all the important info. He also made clear to contact him if there were any issues. That of course wasn't required as we faced no problems.
Both me and my sister would highly recommend Ramon's place for anyone looking for a very comfortable and pleasant visit in Madrid! It was just like Ramon had described and more with excellent transportation links too.