First on the positives:

First on the positives:
The hotel is in a great location, you can easily reach the center of Sofia on foot, and the connection to the metro is very good, the NDK metro station is within walking distance. The breakfast buffet was great, there was actually everything, we didn't miss anything.
The hotel staff is very courteous, friendly and helpful.

The big minus for the house for us was:
WiFi is outrageously expensive if you want it in your room, free WiFi is only available in the lobby and in other public areas of the hotel, but this WiFi is limited to 8 hours for the entire stay, you can't even log out and save time. These 8 hours count from registration in the W-LAN network ...
In the vicinity of the hotel, however, there is the Kulturpalast and also a Starbucks where you can use the free WiFi.
However, we feel a bit cheated with the hotel's WiFi offer, because the prices for comfortable WiFi in the room are exorbitant. A day pass or a week pass from a German home provider costs only a fraction of what the hotel requires.

Another minus is:
We had a hotel voucher, i.e. H. the hotel was prepaid. On arrival we were asked for a credit card as security for any costs that might arise, such as WiFi, house bar, telephone, etc. ... which was okay at first.
So we gave our credit card and then we were told that, to be on the safe side, our credit card would be charged with 300 Bulgarian leva (150 ), just in case we would incur costs. But we don't have to worry, we would get the money back immediately on the day of departure .... When we checked out on the day of departure and asked for the credit, we were told that the credit would of course go to the bank immediately today, but on the bank route it could take up to 10 days for us to have the money back on our credit card.
I have to say, I was really speechless about so much cheek and these two minus points ensure that the hotel does not get a good rating from me.
It's a shame, the rest was really very good, but with regard to W-LAN and credit card charges, the hotel's procedures are very dubious in our eyes, something like this has never happened to us.