 It is too far from the downtown tourist stuff You get tired and are better off staying downtown to go rest in the middle of the day and go back out it is a 30 minute ride to the sightseeing and 30 back and since on the east side of town an hour and a half to Heathrow airport When I booked it did not realize the distance back to Heathrow Remember the subways are loud and impossible with luggage during rush hour The above ground trains are quieter and decent sightseeing same ticket Always see if your hotel has the fancy coach bus express to London Heathrow or stay near Paddington and take the 15 minute express train to the airport with reserved seat Always buy an Oyster card to get around in London it is capped at the daily rate of 6 5 pounds a bargain and starts over not till 0430 the next morning subways stop between 11pm and one am and you are left with night busses so be careful 
 It is great to the subway above ground train portion Fantastic price for a Doubletree warmed fresh chocolate chip cookie and all Great hotel and breakfast just on the west side of the London City airport you have to go up two stations on the above ground subway train and double back to the airport It is two stops from the cable car over the river and the Olympics are on the south side of the river When you go to London the departure tax built into your plane ticket is up to 250 dollars in a business class ticket About 125 in a coach ticket You might explore staying in paris and ride the one hour chunnel train to London and stay a few days in a hotel and go back to paris to sightsee and go home Channel train is cheap if booked well in advance Indian restaurants are great and so is fish and chips all between 10 and 20 dollars After doing it I recommend the hop on hop off tour bus because it takes you where you need to go instead of figuring out which subway stop and includes a boat ride on the Thames and is cheap to extend once you buy the initial two days 