We were in Pamporovo. Coffee in the hotel was fine, but out in restaurants was a bit hit and miss. I think they like their coffee STRONG and only just warm. Found you could ask for a nescafe and hot milk, but invariably it came warm and with three spoon fulls of coffee in ... and sometimes not much milk either. As I say, bit hit and miss.
Sure, you can have many many cups from different kinds of coffee - no problem!!!
The information you read was just for one Sunday morning in Borovets, when there was a problem with the electricity - but still at that time at the lobby of Rila I had 2 strong double coffees...