I am staying there on the 4th, never stayed there before but my friend lives in the Perelik and its an average hotel by all accounts,,,, I prefer the Murgavets but the Perelik is the next one down from that I believe.
I will use the spa treatments in the Mugavets and also probably go round to the murgavets bar before I hit BJ's on an evening, you should also go into the Pamporova hotel bar one night if you get chance