The room unfortunately was very dusty, especially in the corners of the carpet and the couch. You could see tons of dust when sunlight hit, too. But the staff promised it will not happen again and they seemed to take the complain seriously.
Also, the 10E breakfast per day is way expensive for Sofia, 2 persons can eat full breakfast at a cafeteria for less than 4 euros both. I am glad we didn't include it on our stay.
The staff was friendly, we had a big sized room , a super comfortable bed and pillows, hot water all time and free wi-fi. It takes a 10 minute walk to the centre of Sofia.
The tram noise didn't annoy us at all,as many complain, you can only feel few vibrations and that is due to the lines. Hotel is soundproof.