FACTBOX - City rankings

LONDON (Reuters) - London is the most expensive and dirtiest European city to visit but is the best to party in, according to a survey.

Below are the top three European cities in the various categories as seen by 1,100 people worldwide polled for the TravelAdvisor Web site:

* Best Bargain European City: 1. Prague 2. Budapest 3. Lisbon

* Most Expensive: 1. London 2. Paris 3. Rome

* Friendliest Locals: 1. Dublin 2. Amsterdam 3. London

* Best Cuisine: 1. Paris 2. Rome 3. Florence

* Best Shopping: 1. Paris 2. London 3. Rome

* Best Night Life: 1. London 2. Amsterdam 3. Paris

* Best Public Parks: 1. London 2. Paris 3. Barcelona