[Tutor] Pythonic review (descriptors)

[Sage Hack]

I'm looking for somebody willing to review parts of this code
https://github.com/SageHack/cloud-buster and let me know what is not
Pythonic :P

I want to improve my Python coding skills but I'm not sure exactly what
to study next.

Right now I'm trying to use descriptors correctly and I'd like to know
if this is about right
https://github.com/SageHack/cloud-buster/tree/master/bust/descriptor

Thanks :)