Have you added the important note after I made the comment or I just missed it totally? Anyway:
If the European Base is going to be Berlin, members of a larger group of nations will be able to attend, due to the position being almost central from any other European countries. The community that is going to be developed there, as an entity nested inside the German government / culture / etc., will benefit from less ostracism and a wider acceptance even in its weirder facets (cryonics / poly...) thus enabling a better freedom of movement / speech / publications, etc.
Good (frequent/cheap) flight connections are more important than location itself. Flying e.g. from Tallinn to Athens takes about 5 hours (about 3 hours of actual flight time).
In short, I'm wondering what place/group/organisation/activity could do for rationality in Europe what Berkeley does for rationality in the US?
Soon, we'll have LWCW in Berlin, which I hope will be an occasion to do some networking among people who think seriously about developing rationality communities. But in the meantime, let's do some brainstorming.
Important note: in comments to this post, please use only consequentialist language. For example, say "If we decided for the base to be on Malta, then X would happen" instead of "I think it should be in Malta, because..."
Of course, share anything else that you think is relevant to the topic.
Also, see you all in Berlin :)