The price quoted is pretty reasonable, which is the market asking price at the moment. but wouldnt hurt to nego it down.
Since its a 7 year old car, and past the warranty period from manufacturer, by now it would require quite a long list of preventive maintenance to be performed (now knowing what service has been completed), to ensure smooth and uninterrupted driving experience. Rule of thumb is to put aside approx 10% of the purchase price for repairs in the first year of ownership, just in case.
Share us the outcome ya. all the best!