I love the design of their web app, but it's just as unusable to me as their iOS app is. Sometimes typing in an address works fine, but other times (such as my home address), it bafflingly shows me a list of possible addresses that aren't the thing I just typed.

I understand as a programmer why that is (using Foursquare's venue API instead of doing any geocoding of their own) but it still makes it completely unusable, which I find sad since it has so many other great features and tiny polish details.