I think that we're just looking at this in two different ways. You're right in that I'm comparing prices to here, but that's what I always do when abroad. The point of reference I use with regard to pricing in general is Ireland. Hence, to me 50 or 60 quid a night is fine. To be honest, I reckon you'd be doing well to get your own room for much less in a similar type of hotel in the vast majority of European Capital cities, including Eastern Europe (especially taking in a Friday and Saturday night).
By the way, you must have gotten your flights at a very good price if the whole trip has cost you €450. Our flights alone were that much. Having said that, there were cheaper routes available. We just took the one that was the most convenient.