Xidi & Hongcun which one is bigger? Are there any cheap hotel in both?

Hongcun is bigger.

Many hotels are in your choices in both villages, like Liangzhu Café Inn, Xidi Zhishanju Inn and Huangshan Yueanju Hostel in Xidi Village; Hongcun Lanhua Hotel, Yuetang Renjia Inn, and Qingheyue International Youth Hotel in Hongcun Village.

The buses from Xidi to Hongcun depart at 9:00, 10:00, 11:00, 14:00, 15:00 and 17:00.
Chengkan is also good, and you can stay in Longxige Inn, Yinxiang Chengkan Hostel, and Zhongchuan Farmyard Hostel.

You can also pay a visit to Feicui Valley and Tunxi Old Street.

Thanks Michell.

Regarding Feicui valley, is it in Tangkou? Should we stay overnight there? I mean is it big or having many spot to visit. Actually we plan to visit Huangshan from Tunxi. So we never consider staying in Tangkou. Also is it nice to visit there in Jan?

You’re welcome, glad to help!
For your question, yes, Feicui Valley is in Tangkou, about 2km east to Huangshan Mountain. It’s not big as Huangshan, but still owns many scenic spots, like the valley, lakes, and stone carvings.
Jan. is a good time for a visit, since it’s not in the peak season and you can enjoy the scenery better, but remember to take some warm clothes. Have a nice trip!