It was okey experience.
Just one thing it should be mentioned that MOST OF THE ROOMS ARE INTERIOR. There isn’t a window to a street or to a patio so no airflow coming in/out. The only “piece of glass they might call window” faces to the corridors which have also no light and you can’t open. It feels quite claustrophobic inside the room/bunker. Definitely no noise coming in. Some people might love it.
The 10 EURO breakfast is definitely worth it. The best out of it all.