To start with, the two people at reception are very pleasant and helpful; however, the rest leaves much to be desired.
The luggage locker is located very close to the main entrance and is extremely small. The locker in the room is just a 40 cm × 40 cm cubby, big enough for a few items, but you often have to walk back to the main luggage locker to get spare clothes because everything simply doesn’t fit in the tiny in-room locker.
Another issue is that there is only one or two power sockets for 15–20 beds, which is clearly not enough. There are indeed USB ports built into the sleeping pods/cubes, but the charging speed is extremely slow—so slow that it’s impossible to charge an iPad with them; the output power is simply too weak and won't charge at all. If you want to charge your devices properly, you have to leave them at the reception area where several outlets are available.
The beds are very hard and uncomfortable.
Finally, guests are asked not to talk in the sleeping area, but this is difficult to respect because there are so few common living spaces. It would make more sense to establish fixed quiet hours (for example, silence from 10 p.m. until 10 a.m.) to avoid misunderstandings and conflicts.
I was staying there for the Seville Marathon, and it’s a very poor fit in that context. If you’re just sightseeing, it might be more suitable.