A few years back the Hard Rock Hotel opened. What is strange is for such a name brand they choose to build it in a fairly traditional area very near, but not on the tourist trail. Also surprising is that while it's nice, its not over the top. More of a boutique hotel than anything else. The location puts it sort of behind the Opera and the Operett theater with a short walk past some nice restaurants to Andrassy ut. The price for a date I checked in November is $165 to $1800 a night. I thought that was high until I checked the same date for the K&K Opera (sort of the middle of the road 4star near the Opera) which started at $145 and went up to $450 depending on the room. Boy rates are up in town. The K&K was about $115 a night for years. So the Hard Rock is $20 more and probably worth it. https://www.hardrockhotels.com/budapest/
I have found myself sitting at their patio facing O utca drinking a beer on a few occasions this trip.
There is a Hard Rock Cafe in town too, but that is on Vorsomarty ter in District V, near the river.