Nah. It’s a bathroom...unless there are a bunch of urns or kegs that fit in those holes. To think that despite being invented thousands of years ago, widespread use of indoor plumbing is a relatively new phenomenon, even in the USA.
It is a fast food place.
https://www.bing.com/images/search?q=pompeii+restaurant&form=HDRSC2&first=1&cw=1129&ch=494