I have stayed at Dina's home previously and she was again a perfect host.
=> I was offered a cup of tea upon my arrival and a breakfast in the morning.
=> the house is near a park and the room has a nice view on the garden (very calm and relaxing).
=> not far from the center of London (the trip from the house, including the walk to the subway station, to the Saint Pancrass station must take approximatively 20-30mn at most). A one week subway oyster card for zones 1-4 costs approximatively £50. Hearthrow airport is in zone 6; £2 is enough for a one way trip from there to the house.
=> the neigborood seems safe and family-friendly.
=> easy to find cheap restaurants and convenience stores in the neigborood.