Went there a few times.

I didn't use the room service (do they have one at all? i can't remember) but I doubt it's a robot. Same for cleaning the room and making the bed. I didn't see the staff but they're human for sure.

Basically the check in & check out is handled by a (regular) machine. Like it could be in any other country. And behind the machine is a robot. Velociraptors most of the time. But one, or a few, hotels have human-like robots.

The robot will speak as you get close (saying welcome and stuff). And will react as you use the machine (thank you for check-in, and so on...).

The robots can't move "around" (they're stuck where they are) but move their head and arms a bit when speaking. They know just a few sentences though that they repeat again and again. It's funny but nothing impressive.

The hotel itself is of simple design and clean. They sometimes have original decorations (such as lights on the floors, changing colors and patterns) that add to the "strange" feeling. (The name of the hotel 変な means weird, or strange).

The price is cheap enough. And the 24h check-in convenient. So far all the hotel were very well located in the city I was visiting. So I recommend it to anyone visiting Japan. It's a good hotel and a fun experience.