Forgot to cover this. The condition of the car should tell you a bit but it will depend on how much the seller knows (or wants to tell you). Was it kept in garage or outside, but then a poor quality garage can be worse for rust. If it was kept outside always parked in exactly the same position their might be more rust one side or area than others, perhaps even fading of paint or internal fabrics but hopefully not or not too much at this age of car.
If it's outside it might have been always kept fully locked with the windows up so days like today the internal temperatures would be high but these cars are test to take such but it'll certainly get more sever and extreme heat/cold, wind/rain/sleet/ice/snow cycles parked outside than in a heated and dehumidified garage.
Personally I'd want it fully serviced by time interval on all items before I bought it so that I could as soon as possible use it the way I wanted.
If you've not already done so you can research the common problems with the model generally but also specifically to what is fitted to yours, the engine, gearbox, toys inside, put the details here and others will know.
Even though I've known for decades that "German engineering quality" isn't all it's cracked up to be (Merc, BMW, VW (Skoda)) and allowing for the price difference to generally more robust and reliable marques like Toyota and Honda I was surprised that my wife's car needed the front dampers and brakes replacing at 41k-miles, 6 years - but we don't know the history of use for the car's first 10k-miles.
I've changed the gearbox oil and coolant but you'll never get the dealership to and many owners say it's not necessary. Which brings me on to the often debated cambelt change, if relevant to your model, it's in the schedule for 5 years so you want it by the Dealership if the car's supposed to be fully serviced, plus anything else relevant in the service schedule (these won't/might not(?) include driver's maintenance items that some bother with and others don't.
Vehicle/driving priorities are brakes, steering, suspension (all three include tyres), safety electrics (lights, horn, wipers, blower, etc.), and glass in windows and mirrors., then you can look at comfort and toys.
They will sell the car a a low-mileage premium, whether to you or someone else, so if you buy the car you want full valve for this (justifiable or not) premium in that the car is premium by being as fully sorted as you can have it. You already better understand the real value of a low mileage car than many.
To the salesperson a closed sale is worth negotiating with you and whoever is in charge their side as they will try to get more out of you from add-ons especially financials.