My girlfriend and I spent five nights in Ana's studio apartment, and had a great experience. The apartment is very cozy and well-furnished, the perfect size for two people. The bed is surprisingly comfortable, and closing the balcony window effectively shuts out any noise from the street below. The central location of the apartment made exploring the city incredibly convenient; most of the major destinations are within a 10-15 minute walk away, and the Anton Martin Metro station is literally right outside the front door. We absolutely loved our stay here, and would definitely consider returning the next time we are in Madrid.