Sarcasm?

Nobody is going to walk on it naked. The conditions on the comet are amazing compared to the ISS, which is currently supporting life.

The comet has everything you need, water, organic material, shielding from radiation, decent size, raw material, energy.

That "magnetic field to protect from radiation" part is pretty important, though. (ISS is inside the Earth's magnetic field.)

All you need is a couple of meters of water or earth. The base would be inside the comet at complete safety anyway, and detection can warn you to get inside in case of increased sun activity.

It is really easy if you have just a little material:

http://en.wikipedia.org/wiki/Radiation_protection#Shielding

I think the way it spins would be a problem to bring humans on it.