I found these appartments very nice and comfortable.
I think these appartments are very underrated on websites and in reality they are way better. I travel every month across the world I know what I am saying . ;-)
I agree they need a bit of fixing of blinds/curtains. A latch inside on appartments door to lock from inside would be helpful, rather than relying on electronic lock.
In price of a tiny hotel room you get a very decent size bedroom and a lounge as well. I had the 3 appartments on 4th floor, all very clean and spacious.
Kitchenette in lounge is fully equipped. Its an apartment so you don't get daily room service, but that didn't bother us as we do not create a lot of mess anyway :-). No smell at all, we checked out today, maybe in summer it's different, I don't know. Yes the elevator is tiny, manual doors and can take only 1-2 people with luggage, but it adds fun to your stay.
Location can't be better if you want to be on Oxford Street, it's half a minute walk from main entrance of Selfridges. Overall I would rate them quite high and would definitely stay again. It was an absolute delightful stay. I was in London two weeks ago in a hotel, very nice room, but I would definitely prefer apartment because of its size and comfort.