The good: The apartment location is central - easy access to Westminster, the Thames, a short jog to Buckingham Palace. Washer/dryer in the apartment was excellent if you prefer to pack light and not check bags to avoid LHR luggage nightmares. The mini shop across the street is also a post office which is so convenient! Plus a Cafe Nero and supermarket express nearby.
The bad:
noise at night - we listened to neighbors cursing, having fights, etc.
Cleanliness - ugh - the trundle mattress was bare and horribly stained.
Management: we requested and had confirmation message from management that the trundle mattress would be made up. We arrived and it was not and there were no extra sheets in any closet, just towels. I called management and they said they would look into it, they called back and said the cleaners said it was already done. I sent a photo of the dirty mattress (unmade bed) and had to call again. At first they said it couldn’t be fixed but I insisted as this is what they advertise (in photos) and what they confirmed at our request. They finally had a courier bring a standard linen set (sheet and towels) but we still didn’t have a blanket.