Location :
The apartment is located in the very heart of Covent Garden. If being in London for the first time, I guess it is the ideal place to be. The neighborhood itself is so and so, very touristic, very crowded, dirty enough, with several touristic bars/restaurants around, but with easy access to all the major attractions of the city. Recommended for groups of friends, not so for families.
Building :
The whole building is very well maintained, and looks clean. There is a lift up to the level of the apartment (4th floor), that works properly.
Apartment :
The apartment is old, and looks like it has been through a partial renovation sometime, though very poorly maintained ever since. The lights did not work properly, the walls were full of nails all over around, the TV & router cables hung loose around the floor, the outdoor didn't lock from the inside (kids could open the door and be at the corridor with ease), the outside locker remained open for a whole day without being noticed (we realized so when being back to the apartment after several hours), there was not actually a closet in one of the rooms (only some room space bordered by closet doors, with no shelves, full of some kind of dirty equipment), the closet shelves of the other room had been fallen apart, there were no hangers around the whole apartment for the cloths (not even for the towels at the bathroom), the kitchen floor was very dirty, so was the dishware etc..
Communication/Service :
This was our major problem. People were indifferent, with tiny willing to help. We had booked for 4 adults, 2 kids and a baby. We found 2 double beds made (the sofa bed, not), an extra set of linen/towels in the closet, and one baby cot with no mattress, no extra linen, no blanket. After noticing that (among others), we got an extra sheet! OK.. So each couple slept with a kid on the same bed, and we used the third set of linen/blanket to make some kind of "mattress" for the baby.. Additionally, they refused to keep our luggage for an extra hour after check-out, without even helping us find any lockers around the place..
Overall, I think it is an ok option for those who look for a basic apartment in the London touristic center, and have the willing to skip a lot of deficiencies, malfunctions and misunderstandings. Otherwise, please move on to the next option!