+1
On a shorter trip you can increase the budget flights / hotels etc doesn't cost loads
or take ages & leaving you jet lagged when you get there
After three / four days on the bounce it starts to lose its attraction
I usually try & roll these into business trips if the opportunity arises
Like turning a one / two day trip into longer & weekends are ideal for this
And punting venues are usually busier with a better vibe / more burds etc
I've done Berlin [Artemis], Budapest, Warsaw & Munich - all good & plenty of intel on here
To get some sun at the same time, i'd go for Barcelona or Marbella [Estark]
City locations to avoid IMO. In order of being most shite: 1/ Paris 2/ Amsterdam 3/ Rome
I understand that extending the trip spreads out the travel costs, but I would be jaded after 3 days
its much more fun to do short weekend trips
If you want to see how good things are in the places i've mentioned try doing a Blackpool trip for comparison purposes