a friend and I tried to launch a startup around this a number of years back with really nice mobile apps, and he has a web/Git-based incarnation of something similar going here now: https://cafeandcowork.com
yeah there have been a few of these. ours was https://cafewifi.com … these projects require a lot of effort and we tried a bunch of ideas, but ultimately had to call it quits after a while on that one