Welcome back!

I'm not sure about a specific EU RP server, but traditionally Balmung on the Aether server group (US Legacy server) is considered the de facto role-play server in the game. It's where most of the 1.0 roleplayers flocked too, and thus they kind of kept the RP community going there into ARR. As it's a US server it's based in the same physical data centre as the 'EU' servers as well.

And yes, trust me on it when I say so, but you don't have to look far to find people rping on Balmung - just walk down the street in Ul'dah or Limsa and you'll soon find what you're looking for.