The good: 3-5 minute walk from Farringdon and Barbicon Underground stations – Farringdon is 1 stop from King’s Cross where one can connect to practically any place on the Underground or Britrail
Efficiency apartment is small and adequate for a couple, not so good for more than two.
The flat has two heating units and the temperature was always comfortable.
Owner is very communicative and helpful; flat was spotlessly clean. There is a small kitchen with a small refrigerator, sink, and oven/stove.
The not-so-good:
Smithfield market opens at 2 am so that on Monday through Friday mornings, there is street noise as is stated in the AirBnB writeup. The owner has tried his best to mitigate this with closed windows and acoustic curtains. It really didn’t bother me, but my wife found it objectionable. The flat is better suited to weekend use when the market is closed (that’s Friday and Saturday nights) (i.e., doesn’t open: Sat 02:00 and Sunday 02:00).
As advertised, but just to be clear, the flat has no TV, washing machine, microwave, or dishwasher. There isn’t a clock in the flat. And while there is free wifi, the speed is slower than cell (I measured it at 1-2 mbps; cell was 8-10).
Finally, the check-out policy is strict. You must be out by 11 am, no exceptions, even luggage.