We loved this apartment - the location was excellent, with really pretty views from the living room and kitchen windows. Our hosts were very, very helpful and flexible, and they gave us great advice about places we should go.
The weather was great, but there was AC if the day got warm. The bedrooms also had retractable window shades that could be lowered if you wanted to sleep late in absolute darkness - that was wonderful.
The bathroom and kitchen were just refurbished and are lovely. The water heater is not very large, so plan to take military showers, but it was not a problem once you knew to be quick. Also, the building elevator wasn't working after the first day, but luckily it was fine when we arrived and it's way easier to carry bags down 5 flights than up!
I would definitely recommend this as a great place for being close to the historic center of Madrid - if I go back to Madrid anytime soon, this would be my first go-to. Thanks again to Ana and Luis!