Radisson Blu Hotel, London Mercer Street is an upscale hotel ideally located near popular attractions like the Cambridge Theatre and Donmar Warehouse. Guests often appreciate the central location and the friendly, helpful staff, which contribute to a positive overall experience. The hotel offers a range of amenities including a restaurant serving Peruvian cuisine, a gym, and free WiFi, which enhance the convenience of the stay. However, some guests have raised concerns about cleanliness, particularly regarding room maintenance and the state of carpets. While many reviews highlight a generally clean environment, a few guests noted that their rooms could have been cleaner, which may impact comfort for some travelers. Additionally, there are mentions of limited breakfast options and small room sizes relative to the price, which could affect perceived value. Overall, while the hotel has many strengths, including its location and staff service, potential guests should be aware of the mixed feedback regarding room cleanliness and value for money. It's advisable to manage expectations regarding room size and maintenance to ensure a satisfactory stay.