The soundproofing is poor; you can hear the airport announcements.
However, the location is excellent, perfect for travelers with a very specific and singular purpose (i.e., catching an early morning flight).
For restroom facilities, use the public one to the left of the entrance. There's a children's sink that adults can use to wash their feet (though not recommended, as we should be considerate).
Disposable slippers and dental kits are provided.
There's ventilation in the deluxe cabin, but it's noisy, so it's better to turn it on for a bit and then switch it off.
While you might consider hotels a few kilometers from the airport that offer free shuttles, for travelers arriving late at night and flying out in the morning, ask yourself: shuttles run every 30 minutes or an hour (they don't cater to you on demand), and then you still have to check in. That's at least an hour of hassle. For those arriving late and leaving early, why would you look for a hotel instead of just making do on a chair overnight? Presumably, it's just to get a few more hours of sleep. And that's precisely the purpose of this hotel: to allow you to "hit the sack" in the most straightforward way possible. Everything else is secondary.
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