Seeing that Google Maps now allows open collaboration, I’ve started a European Travel Map that allows anyone to add to it.
Feel free to add in any useful info you can think of:
Hotels to avoid, ones that are good
The best pubs & clubs
Engaging museums or art exhibits
I would envisage that in the future, a collaborative knowledge map could be a great resource when planning a trip away – combining hotel reviews and restaurant recommendations with a visual reference to the city – making it easy to find out what fun things there are to do in the area you’re in.