Mercedes & Jose's apartment is the best I could have hoped for. A hotel nearby told me they were overbooked last minute and Mercedes answered me right away. Everything in the apartment is brand new and super clean. It's right in La Latina and there are cute restaurants and bars right on the street. But the apartment is on the interior side of the building so it's very quiet at night. So it's the best of both worlds! They also provided coffee and some breakfast stuff which was super sweet. Wifi worked great.
Would definitely stay here if I find myself in Madrid again!