On my first trip to London, I stayed at the Radisson SAS Portman Square. I had taken the night flight from the U.S. and arrived at the hotel around 10am. However, my room type was not available at that time, so I took a single room (at the same price as the larger room - which was an ok deal for me at the time). Let me tell you - it was a single since it had only a twin bed, but it had most of the other amenities I needed.
When I entered the elevator, I discovered that different floors appeared to have differently styles of design. My room was evidently Scandinavian in style, which went along with the minimalist nature of a single room. For example, there were no extra pillows in the room.
I could not locate a clock in the room, so I called downstairs to request one. However, they did not make them available (wake up calls are the only alarm at this hotel). In fact, the front desk personnel suggested I just call whenever I wanted to know the time. I thought that would be weird and inconvenient. I did eventually discover the clock on the TV and commit to buying a travel clock for myself.
The room came equipped with a hair dryer that looks more like a small vacuum cleaner. It did the job, but didn't heat up quickly or get very hot. However, the handle got almost too hot to hold.
The best benefit was the free WiFi. I'm all about free Internet and feeling connected when I'm traveling.
In terms of the location, Portman Square is in walking distance to the Marble Arch and shopping on Oxford Street. I even walked to Buckingham Palace, although most people might find that too far.
I would consider staying at this hotel again, but I might try my luck with a new place next time I'm in London.