Sounds okay.

If you have the inclination, learning enough about bike maintenance snd repair isn't all that hard. Online resources are there (the bicycle tutor videos at youtube.com cover many of the basics; Park Tools has excellent tutorials; Sheldon Brown is great). The tools are basic, and they are good to have. You'll want to take some along anyway.

The lowest gear he mentions (26-tooth on the chainring, 28-tooth on the rear cog) is not that low. It's okay, but many touring cyclists like having something lower. No big deal, and not that hard to change.

The extra wheels are a plus, if priced right.

What are the other extras he mentions in the ebay description?

The racks, if decent, are a definite plus.

This looks like a viable option for you.

(That said, there are other viable options. Have you looked at the Nashbar touring frame? If building up a bike from scratch inspires you, it might be worth consídering. There are some good posts on multiple threads about the Nashbar build.)

There are multiple viable options, rather than one single right answer.

I would also ask why he's selling it.

There are some good posts about the Windsor on this forum and elsewhere. This is one good thread,