Hello everyone!! This is my first post here and unfortunately I'm already asking for advice. First, a little about me. I really haven't had much more than a passing interest in bikes over the years, having only casually ridden them over the years. I have always gotten my bike at Walmart because I didn't realise until about 3 days ago that I was totally missing out on "real bikes". I would like to think I have gone through my last Next or Roadmaster bike and instead am going to buy a used bike off Craigslist. I stumbled across a 2006 Trek 7500 FX a couple days ago for $250. I have decided on a hybrid because although most of my riding will be on concrete I'm sure I'll decide to hit up some gravel roads from time to time and I'm thinking a road bike shouldn't be used for anything but solid asphalt. I have included a picture of the bike in question and would love some input on it. The person selling it mentions that it has "Rolf Vector rims" and it's 22.5 inches and lightly used.

Thanks for all your help!