Unfortunately, not all the reviews about Fabian Roncero's gym are positive and here's a quote and a review from the website from one customer who's obviously not very satisfied. (Translated from Spanish).
"The pool facilities are good, it is its biggest attraction, and for the price of €35 it is good. The trainers are friendly and brighten up the atmosphere. The rest, bathrooms, machine area, etc. are the worst I have seen, very old, in poor condition, several do not work and it is always saturated with people.
The worst thing, without a doubt, is that it does not seem to have a capacity limit and it is always crowded. You literally have to queue to use a machine, even now in the middle of August.
The capacity should be regulated and entry should not be allowed indistinctly.
The women who attend the reception should receive training in customer orientation. Either they always have a bad day, or they are like that and I have a hard time understanding how they have been hired for a position facing the public. They are not shy when it comes to showing their disgust at having to serve you, their bad gestures and sarcastic faces, especially the dark-haired girl at the main entrance."