London is a beautiful and charming city. It is one of the greatest, if not the greatest city in the world. However London feels very decentralized to me. A lot of the housing right up to the core is very low rise 2 and 3 story buildings. My understanding is that the square mile "city of london" is supposed to be the focal point of the city, but it really has several key nodes.
Take this street in Wapping for example:
https://goo.gl/maps/SPuPa69SJy82
this is really close to europe's biggest CBD's yet the buildings look like something you would find in suburban Queens.
i would expect the dense blocks of medium rise buildings you find in downtown barcelona, paris, etc something more like this
https://goo.gl/maps/AxG7rC5QoPz