Marcus is a very good host. He is always ready to help us. He explained what we can do in London and about rail station. We spent a great time in his house.
All descriptions are true.
The tube is very safe and Harrow is on a main tube line, direct to the center of London.
We advise you to buy your oyster card (for underground) in the eurostar (charged with 15 GPB).
We recommend Marcus 'House.