$700 for Defy 2 Composite

Hi y'all, as a road bike newbie I've been looking at the secondhand market for a potential first bike.I just saw this defy 2 composite posted online and it also had the following notes:

• Medium Upgraded carbon wheels, less than 200 miles Carbon fork Carbon seat post Aluminum frame Continental Gatorskin tires, less than 200 miles SRAM Apex brakes and

They were asking $700 for it, and I wanted to ask whether this was a fair price, and what, if any, counter-offer would be reasonable.

Thanks y'all!