Really cool apartment close to plenty of restaurants and a short walk from tourist spots. People have said it already but photos do not do this justice, it's really quirky and very comfortable. Leticia was very responsive and we never had to wait long for an answer to any question we had, before or during our stay.
We were pickpocketed in a bar near Puerta de Sol (not near the apartment) and Leticia was really nice and was super quick to give us details of where to go to report it. I'm mentioning this here to remind even seasoned travellers not to bring full wallets/passports out unless you need to, the apartment is very secure so a safer place to leave things.