How to retrieve Twitter username with UUID
It is not possible with the current version of the dataset, the User.txt ids are hashed. But, the pre-processed features are in UserFeature.mat which you can load with something like 

import scipy.io
mat = scipy.io.loadmat('UserFeature.mat')


mat['X'][0] will then be the feature vector for the first user id in the text file.

There are no descriptions of the feature names either (or at least I didn't find any)