Mary's very helpful and caring. If you need anything- you can just ask. Our stay was amazing and we could not have asked for a better host.
The only thing I will definitely say- do not get the tube between 5-7 pm, it is horrible and you won't enjoy it. There is just so many people, but then again thats normal for London. Also, definitely go get breakfast at wetherspoons at Victoria Station- it was so good and cheap and close to Buckingham Palace which is so cool to see.