Airbnb.com is a popular site with the option to advertise sublets! I've used it to help a client in the past. Just post some good photos and write a nice, detailed description. People really like to see pictures. Make sure your place is tidy. It's a good idea to open the windows to let in good light. Turn on all the lights! A picture from the outside helps. Include the schools in that district, local entertainment venues and major nearby employers. I hope this helps!