Aido,
I've been to Bulgaria several times, but a few years ago now. I was up the coast at Golden Sands. That looks a nicer resort (hotels scattered about in woods up the hillside) as I passed through Sunny Beach on my way to Nessebar (a quaint-ish ancient village on a promontory just a bit further south)
Yes, beer was cheap, food good with as good a selection as any British high street - Curry, Chinese, burgers, kebabs. A great family destination... in the day time. At night it all changes - from about 7:30 the young girls come out looking for trade, can get a bit tiresome saying no all the time. A few racy bars with strippers etc along the sea front too.
I really enjoyed Golden Sands resort. there is a web site, check it out... somewhere
http://www.goldensands.bg/
there it is.
You'll love it with a bunch of mates. They all speak good English.
Cheers,
Paulk