Hotels-Finder is a very handy Google tool for locating hotels throughout Europe. It uses Google maps, which lets you drill down to almost any city you want. Once you zoom in close enough on a particular town or city, you can view the precise locations of most popular hotels.

Note that it does take up to 20-30 seconds for the hotels to load on the map if there are a lot of them, so be patient, and watch the status messages at the bottom of the map window.