When we went to our Madrid trip we found this room highly recommended in the UK rankings and decided to go.
You can choose to have it either in English or Spanish. It is NOT a room for English speakers. Majority of things are in Spanish - our Game Master had to translate it. All of this and the clues were a parrot with walkie talkie glued to it and you could have not understand or hear anything they were saying - especially that they were also doing a "parrot voice".
This room is designed for families with small kids. It's massive and the design is good! But if you are an escape room enthusiast (and don't speak Spanish), do avoid it as it does not have good puzzles and the parrot is insanely annoying and very very bad sound quality.
The Game Master was nice and tried to help as much as he could. Only because of that and the size of the room that place get some stars from me.