Allow me to offer you an idea: When I go to Yelp to search for a restaurant, the filters I have available are type of restaurant, proximity, rating and price. My next step is to either sort by those filters, or individually click a restaurant. Looking at an individual restaurant, my options for consideration are photos of the restaurant, consisting of either interior/exterior or images of the food, and user reviews.…
So with the above idea, I would recommend the user need only simply 3 things: 1) photo 2) restaurant 3) whether they liked it or not and an optional 4) description.
If it's an iPhone app then you automatically pull geolocation, but if it's through email, I'm not sure how this would be done and you'd have to explore what you can do.