The price given from the night porter (50Sol incl. breakfast) was not valid as soon as we checked out. The guy at the reception tried to charge us 55 + 6 Sol for each breakfast. We only paid the price the night porter told us and went to the tourist office to file a complaint. The woman at the tourist office rechecked our complaint and called to the hotel asking for the price for a double room. The person in charge told her 40! Sol incl. breakfast.
The trick is that the hotel has got a sign at the reception which shows the price of 55 Sol.
So, when you pay the room referring to the price which was given to you (by phone or by someone else) the man at the reception will point to the sign telling you that you must have understood something wrong and the price is 55 Sol + breakfast.