F00, that Santana looks like a pretty nice bike as seen through the tube of Internet pictures. The seller describes is as having centerpull brakes but they look like linear-pull to me, or a form of cantilever. He probably has no idea what real centerpull brakes look like!

Check the state of the headset. On a newer bike like that it wouldn't be too hard to find a replacement, but it's worth checking if it needs it.

It doesn't look especially big but with no reference points that's hard to judge.

Check out how it handles. IIRC, Santanas are known for having high stability. Some people say they are sluggish, but some people absolutely love them for that. Maybe you can find a reference online for that particular model.

Good luck with it!