The flat was amazing! It looked so perfect in the listing that I was afraid it wouldn't live up to it in reality, but in reality it was even better than the listing.
Richard met us on our arrival, gave us keys, and showed us the very informative folder about the flat and the neighborhood. The folder had details about how to work the shower and appliances, time and location for garbage pickup, etc. We were very comfortable in the flat, and quickly felt at home. We felt especially welcomed because Richard (or someone) had left us a loaf of bread, some good tea, milk, and a few other staples to get us started.
We hadn't planned on visiting the Covent Garden Market, but since it was only a block away we visited it several times, as well as the Jubilee Market on the other side of Covent Garden Market. The flat was convenient to a Marks & Spencer and a Tesco for groceries, close to many restaurants (I especially recommend Masala Zone), and a short walk to the British Museum and the theatre district as well as a great deal of shopping. It was also easy to reach other attractions via bus or Tube.
Since Covent Garden is such a busy place, the streets were busy until late at night, with buskers performing well into the evening. We could hear the street noise in the flat, but not at a bothersome level, though someone used to the countryside might be bothered by the sounds from the street.
Do be aware that there are a lot of stairs, so if stairs are a problem for you then this flat isn't your best choice. The flat's description mentions the stairs so it wasn't a surprise for us, but I want to emphasize it: there are two flights from the street to the flat's first level where the kitchen and living room are, and another flight from there to the level with the two bedrooms.
If I'm able to return to London for a visit in the next few years, I will definitely try to book this flat again!