You can't go far wrong with Coffee & WiFi and the Coffee & WiFi map doesn't go wrong at all.
This Google Map shows the location of nearby coffee shops with free WiFi. Adding new coffee shops to the map is very easy. You can add a short review of the coffee, ambience and WiFi on offer and even post a photo with your review.
Currently the map has a lot of locations added in Denmark and it has a growing number of users worldwide.