The location close to the Chain Bridge was very good. For $3 more per night, we stayed in a Superior room, nearly twice the size of a standard room. The room was clean and comfortable, but the maid staff had a habit of opening the door without knocking, despite the Do Not Disturb sign being in place. The room was at the end of the hallway and electrical wiring was not extended into walls on 3 sides of our room. Without unplugging both the TV and a dim lamp, we had only 2 outlets, none within 15 feet of the nightstands. Ridiculous. As a retired airline captain with 24 of a 37 years career spent flying to and vacationing in over 100 cities in over 40 countries, this was the worst electrical layout ever seen. The friendly front desk staff was not very helpful with simple questions. The evening and morning desk staffs do not communicate together. The woman at the desk the morning we left was in chaos mode regarding the two shuttles arranged to pick up our group. Overall, I assess this as a nice, 3-star hotel. Given the electrical layout and front desk staff, I would look elsewhere for a next stay in Budapest.
Two points deserve extra awareness: (1) There are two, distinctly different but nearly identically named hotels near each other: Carlton Hotel Buda Castle and the Buda Castle Hotel. (2) Unless driving/parking in their garage, the hotel is reached by walking down 15-20 cobblestone stairs or by walking uphill on a short but substantially inclined driveway.