We used it last year to kill time on the last day waiting for the coach to the airport. It was fine. It's not huge, but it isn't particularly busy either.
Rink looked OK. It is next to the Tyrol restaurant and seemed to be quiet most of the time (possibly due to the dodgy music it played). Bowling at the Samakov hotel is worth a look - it costs about £2.50 per person , only downside is that you have to do your own scoring.