We stayed 5 days at Hilda's and had a really great time.
Her house is located in a quiet area. Bus stop is right in front of the house and there is a tube station within a 15-20mins walk. Also, there are good connections to Gatwick and Luton airport (don't know about the other airports).
Hilda was very friendly and helped us finding the right buses. She lent us two Oyster cards, which was very helpful and saved us a lot of money.
We had our troubles with the shower, sometimes it was very hot, sometimes very cold. Apart from that, the room was perfect. There is enough space for clothes and the bed is very comfortable. It was very clean.
We can definitely recommend to stay at Hildas.