Fernando only does long term reservations, but my friends and I were able to squeeze in a short term booking between two of Fernando's long term reservations. From our very first contact with Fernando, we were extremely impressed. He gave clear and precise instructions on how to access the apartment, and even tips on the locale and city. Keypad entry also made our check in to the apartment very convenient and seamless.
In much the same vein, our stay in the apartment left us similarly impressed. The location of the apartment was extremely central and convenient - walking distance to Sagrada Familia and a short ride via public transport to most landmarks. Meanwhile, the apartment itself was extremely clean and spacious - a lovely living room, a patio, a large kitchen, two bedrooms and one bathroom. All amenities worked as advertised - hot showers, air conditioning, washing machine, etc. If you are able to secure a stay at Fernando's during your time in Barcelona, be sure not to hesitate.