Carlos was a great host, very flexible with the check-in time as was arriving quite late in the evening. The best thing about the apartment is the location, less than 1 minute Opera and 5 minute walk from Sol - from here can get anywhere in the city with ease. Was in Madrid for a work trip so didn't spend much time in apartment but it was a great base with all the amenities needed. Carlos also included lots of tourist brochures which was helpful for enjoying our days off!