Have you not looked at the search facility on AW?
You can specify age range, price range, location (including distance from a postcode, both specified by you), nationality (with the possibility to include or exclude particular ones), likes and dislikes (I always tick dislike BB) and, many other criteria that you can specify.
I don't think there's a category for slimness. For that you might just have to do a bit of work looking at individual profiles. Then of course you can check via the AW ID whether they have been reviewed here. If you strike lucky you could even leave your own review on here.