I stayed at this property in August for 9 nights while at the Olympics. So nice someone got upgraded, because their rooms are super tiny! I do remember lots of traffic getting to TS and the Forbidden City and every across town ride being at least 30 mins to go a short distance because of traffic, but it being super cheap. I don't remember there being any subway station near by. We always took taxis.
I do remember though that we were totally ripped off getting to the hotel from the airport. We were charged 400RMB - and we didn't know this was so much more than what is the norm from a regular metered taxi so watch out for that.
Also the head concierge at this property will want to arrange transportation for you to go to the Great Wall, and will want to charge something like 800RMB. Don't be fooled.... you can negotiate with a driver for much less. Maybe we are naive and that is the way it works there, but those were the two times we had to be careful with the taxi situation. Enjoy!