A question: I'm curious whether you put a lot of consideration into the review system?
Asking hosts to invite strangers over and publicly rate their hospitality, cooking, and home is asking a lot. Yes, Airbnb does something similar, but renting a room feels like more of a business transaction. Having dinner guests share a meal is more personal and intimate - and it would be easier for hosts to take reviews personally.
Also, how will you deal with hyper-critical guests who leave mostly negative reviews? A few negative "foodies" like this could be a morale crusher for early hosts.
In any case, good luck!