I'm an expat in Beijing who has lived here for over 5 years. I own 3 apartments in the city and would be happy to rent out a room/apartment to you during the Games. My apartments are 10 mins (by taxi/bus) from Da Wang Lu/Si Hui/Si Hui Dong subway. I will drive you to and from the stations in my own car (a 4WD). These apartments are also 5 mins away (by taxi/bus) from Chao Yang park where the beach volleyball events will take place. Again, I'll be happy to drive you there if you are going to this event.
My rates are as follows:-
EURO 80/day (double room with shared bath)
EURO 95/day (double room with ensuite bath)
EURO 170/day (a 2 bedroom apartment)
EURO 220/day (a 3 bedroom apartment)
A GSM Sim card will also be provided so that you could make calls when you need to be picked up from the stations.