I had a great stay in the apartment. It is so spacious. The apartment was very clean, there is a very nice kitchen including a big oven and a microwave. Also, the beds are very comfortable and it has a nice sitting area with a great couch. The location is great, super central. The contact with Art & Flats was perfect, they quickly responded to my messages and they even have an office in the building you can visit if you have any questions. However, there a few things to keep in mind.
The apartment is quite noisy. In one of the bedrooms you are able to hear the television and can even follow the conversations of the neighbours. Also, although the kitchen is nice and a great invitation to cook, some kitchen essentials were missing (for example cutting boards, cutting knifes and wine glasses).
Nevertheless, I will definitely book this apartment again when I'm in Valencia.