Superb location. The neighborhood the building is in has gorgeous art nouveau and art deco buildings and grand boulevards. It's a short walk to the historic center, both train stations, and the subway, and only one block to the Russafa Market which is better than the Central Market.
The apartment itself is well laid out, and ample for four people. The views are excellent, and the balconies are wide enough to put a chair out to get some sun. The kitchen is the best equipped by far of any rental we've stayed in: gas stove, stick blender, lots of decent knives, multiple cutting boards, etc., etc. Very good hot water supply too.
Not least, checkin was super easy, and Sergio was super helpful and friendly. He responded quickly to every question we had, and booked us a taxi to the airport.