Although I reserved a room at the Mercure London Hyde Park, when I arrived they seemed to be overbooked and really behind on check-in. They seemed to not have a record of my reservation and did a lot of whispering back and forth between each other before shuffling me over to a sister property. I would recommend calling to confirm your reservation a few days ahead so you are not surprised if it isn’t at the location your booking reservation shows. With that being said, the sister property (the Hotel Indigo Paddington) and the staff was really amazing. I will stay with them next time I am in town.