Nothing like a pack of gloom and doomers to suck all the fun and life out of your idea, right? Well, let me pile on.
You promote the "freshness" of your content. And today it might be. But as someone experienced in the development and deployment of content that requires maintenance or upkeep on the part of the end user, let me tell you that it really won't be for long. The "hands-off" approach you're embracing is the path to ruin. At first people will be gung-ho about doing their own stuff, but that initial enthusiasm will very quickly wane. What you'll end up with is a bunch of outdated, broken, and irrelevant information. And because you can't control what they do, you won't have much recourse to rectify the problem.
If you seriously want this to work, you need to recruit people to fill the spots for you. You need to recruit bloggers to review the restaurants, insiders to give real tips about the hidden gems on the menu, You and your partner need to be actively involved in the day-to-day content decisions. You need to constantly evaluate what is on the site, what works and what doesn't.
The idea of "no overhead for you" will carry you directly to "no income for you" either. And that's the bottom line.
Your idea is not bad. But there are tons of great ideas out there. The difference between a great idea and a great business comes down to three basic things: 1) Committment, 2) Opportunity and 3) Execution. I think you've got some committment but you really need to go all-in to make something like this work. There may be an opportunity (although the field is crowded). What kind of marketing budget do you have? Word of mouth won't carry it. As for the execution.... well.... I can tell that nothing anyone says is going to make an impression. You've taken the other constructive criticisms posted here and instead of hearing them, you've attempted to debunk with your own logic. Carry on. I wish you well.