Is this Audi xxx for sale priced fairly?

Is this Audi priced fairly, or am I missing something? I’ve been looking for a used A4 around the $20,000 mark for weeks and every decent one seems to get snapped up fast. This one is listed at $22,500, which feels a bit high, but it has low mileage and the seller says it’s been serviced regularly. I’m in the Denver area and would use it for commuting, so reliability matters more than getting every option. The price has me second-guessing it, especially with used-car prices still all over the place. What would you consider a reasonable offer?