Nyarlathotep said:
I don't know much about Amsterdam, Barcelona or Copenhagen so I have never thought about visiting them. I take it that you have benn to all three, though, so I am willing to take your word that they are nice cities and would be good places to hold a TAM. I am a history buff so, truth be told, all they would have to have is a history museum or two and a handful of historical monuments and/or buildings and I would be as happy as can be. I am sure any major city in Europe would have plenty of those so I am sure I would enjoy my stay anywhere over there.
Right. Any European city has several centuries´ worth of culture; London and Paris (and Barcelona, I think) have been around for more than 2,000 years, Rome and Athens even longer.
If you want lots of culture and history, visit Athens, London or Rome - or maybe Paris or Amsterdam.
For the best intercontinental air travel connections, choose London, Frankfurt or maybe Paris.
For relatively low prices, choose Prague or the vicinity of Frankfurt (at 600,000 inhabitants, Frankfurt is not that big, and public transport is very good, so "outside Frankfurt" is not far away)
In winter, Kopenhagen and Stockholm might be bad ideas. In summer, Rome and Barcelona ARE bad ideas (I have been in Rome in July and do not want to repeat that experience).
As an outsider entry, Malta (more exactly, the capital La Valetta) might be worth considering; it has history and culture, everybody speaks English, it is warm enough in winter (though atrocious in summer) - but I am not sure if there are adequate convention centers. It is also not so overrun with tourists, and most of the capital has kept its "small mediterranean town" charme. I´ve been there twice and would like to return.
Disclaimer: of the cities discussed in this thread, I have never visited Stockholm, Paris, Prague and Athens, and I have been to Berlin as a little boy only, so any information on them by me is hearsay only.