D G.
Yelp
AMAZING location, amazing flats. Full kitchen, well-equipped, even includes washer/dryer, which allows travelers to pack lightly. So perfectly located right next to the Tower of London and transport via Tube, DLR, bus, and Thames Clippers. Plenty of restaurants nearby, along with grocery options within 5-10 min walk.
Super-clean, air conditioning available, amazing Arran products provided. They even provide eggs, bread, milk, coffee, jams, and fruit when you check in. Breakfast "at home" before sight-seeing is so convenient.
Cannot fault anything except the variations you will see in the floor plans from the photos they post - some units have significantly larger balconies than others, so ask ahead if this is important to you - ours barely had space to even get outside, much less enjoy being out there, especially as the best view was only accessible from one of the bedrooms.
Again, would stay here again and again, budget permitting. There is nowhere better.