The apartment is in walking distance from Plaza de la Merced and the city center. It is easily reachable by bus (lines 1, circular 1 and circular 2). The apartment is situated at the top of the house. It is reasonably equipped (fully equipped kitchen, Tv set, furniture, comfortable beds…). I appreciated three air-conditioning units - very useful in hot days. There are two toilets and washbasins and one shower (I would recommend a shower head holder). You can use wifi in the apartment: the wifi signal is strong in the kitchen, living room and on the terrace, but very weak in the bedrooms. On the ground floor, there is a broom room with a washing machine - this is very useful, especially if you stay for longer). The terrace is private, equipped with a table and plastic chairs (the paint on the metal ones is chipping off). The terrace is pleasant in the evening when you can enjoy a glass of wine there.
The surroundings of the apartment are quite quiet. There are two supermarkets nearby: Dia, and Carrefour (Carrefour is a bit better than Dia). In the surroundings you can find a lot of shops, cafés and restaurants. They are in the neighbouring street, so you do not have to be afraid of any noise.
Fede is a great host. The communication with him is great. He is readily available via Whatsapp as well as by phone. At the beginning of the stay, he will welcome you and provide you with a lot of useful information.
All in all, I was very happy with the apartment and I definitely recommend it.