Both Deci and Yong 'an are OK, and the environment is OK, but Yongding is not very good. I used to be in Yuanbao Mountain Villa, with pure natural scenery and good feng shui, but now it is far away in Jixian County. You can visit Qingming.com, China. If it is better than the above two in the city.
Xicheng is not bad. A friend's grandparents are here. They have been there several times and feel that the environment is good and quite clean and tidy.