It is worth booking for ease- central location, the Piccadilly tube takes you straight to Heathrow; easy access and stairs, groceries, cafes, restaurants and stores are down the street. All attractions are within walking distance, granted most places take a half hour to get to.
There is a full size bed with about 1-2ft space for moving around it. Great window light. A drop-leaf table touches the bed when open. Two folding chairs. That is the entire space. Ample closet space. Ironing board and iron, hair dryer. The TV has a handful of channels and the lowest volume is super loud. Wifi is typical for Europe- sometimes great, sometimes not.
The kitchenette has about 4x2ft space for moving, plenty of plates, microwave, hotplate and electric kettle. One small sauce pan. Mini fridge. Sink is 8-10in wide.
The bathroom is tiny. The separate-faucet hot-from-cold-water sink is a triangle,, the size of a handprint. The shower has the greatest hot water and pressure, and is about 2x2ft in size.
Absolutely worth booking, especially if for only a couple of days and you spend most the time outside.