NewTandem

Hi, a co-worker's relative is willing to sell me a Burley Rock and Roll for $450. I would appreciate some input/thoughts from everyone given the following:

1. My wife and I are newbies at tandem. My wife is a novice at bike riding (i.e. can ride a bike, but not 100% comfortable), so I think a tandem is a great way of getting her back on the saddle. She is 5'1".
2. The Burley Rock and Roll is 21" in front and 19" for the back, so I'm pretty sure it won't be an ideal height for my wife as the stoker. However, I'm hoping it's manageable, but anyone have any thoughts on this?
3. The Burley has new tires 2.1 inches wide and 26" wheels. Also has a 7-speed cassette, triple crankset, and an Arai Drum brake
4. I know absolutely nothing about bicycles, lol. But, this seems like a decent value.
5. I have not checked out the tandem in person, as it's located in another state. I do have a vehicle to adequately haul it.

Picture's are attached. Thank you in advance for any input.