Alright! Wondering for some advice on where's good to go for a 4 day sesh with my mates.

Going in October, try do it every year for my birthday. So far done Prague, Budapest and did Amsterdam a few months ago. Just looking for somewhere cheap with a good bit of pub/club atmosphere.
Cheers!

Never been there but Sofia?

Romania is a good bet. Our girls are awesome and everything is like two times cheaper than in the UK. You should definetely put Bucarest on the list.