I booked and payed for a 2 bedroom apartment, but was downgraded to a simple room. No explanation from a very rude reception worker, except that I could not expect to get what I booked. And no discount offered, even if the room I was given was at least 25 euro cheaper than what I had payed.
I have stayed at this hotel about 15 times before, and it has always been perfect. I hope next time it will be ok again, otherwise I will find different accomodation in Sofia for the future.