Pro's: Location is fabulous; steps to Leicester Square tube station and in the heart of Covent Garden. An ideal location for walking & tubing. Comfy beds, 2 bath, functional kitchen and nice spacious living/dining room (overlooking the action on St. Martin's Lane). Really enjoyed our time there, relaxing after busy tourist days.
Con's: Apartment shows it's age but is comfortable (pictures are pretty accurate). Washer/Dryer is a Washer/Spinner; good for limited use. Communication was reasonable (except for an oven issue we resolved on our own). Bathrooms could use an update but functional. Newer smart TV needed. Overall cleanliness is good; not great.
Criticisms aside, I would recommend Guy's apartment in Covent Garden as the location can not be beat.