You have to taper your expectations for a luxury stay. This is a novelty hostel to stay in. As it's a bunker, it really plays to the theme. It's deep underground and dark by design. It does wind up a bit chilly inside, but the sleeping bag i was provided was surprisingly warm. Breakfast was a simple affair, a basic buffet. You don't get any phone signal inside, but the wifi actually works for once. Showers attempt to be warm, but you have to keep it running to get some warmth, possibly not ideal if you're feeling under the weather.
It's worth noting it's also a museum, so depending on where your room is, you may be hearing the music and videos for a fair amount of time during the day. I found that when the museum is closed on monday or any time after 7pm, you have to ring the doorbell for a member of staff to let you in. It can take them a while if you're coming back late at night, but not a big issue and at least it's secure.
It's an experience, worth trying out, just be mentally prepared for it.
