I have created a running website named www.askrunguy.com based on having run over 100 half marathons, including all fifty US states and several other countries; and several full marathons, with a goal of running all six World Major marathons. Below is a template for comments for my rating each race:

Race: London Marathon 2019
Race Type / Terrain (road, trail): paved road throughout London by River Thames
Organization (Expo, volunteers, start / finish): Very good. Well organized. World major marathon, 43,000 runners and many thousands of supporters.
Support (fans, music on course): Not too many bands, but the fans were very loud and prevalent.
Course Scenery: Excellent seeing great sites around London: Big Ben, Cutty Sark, Tower Bridge, Westminster Abby, Buckingham Palace,
Course Difficulty: Pretty easy. Pretty flat and fast course, with several turns.
Weather / Temperature: Nearly ideal. Low to mid-50’s F; overcast, cool, no rain.
Course location recreation (sights, things to do): Lots of things to do in London, and in surrounding areas (Oxford)
Logistics (Getting to the race site): Many flights to London Heathrow airport
Swag (medal, t-shirt, other items for finishers): Pretty decent medal and finisher shirt. Expo ran out of gear fairly early
Food and drink (on course and after finish): Food and drink on course is fine. Plastic water bottles on course.

I provide running and racing resources for all levels of runners at www.askrunguy.com. I also share information that I believe is interesting and helpful to the running community. I encourage you to visit www.askrunguy.com