Thanks for choosing us for your answers.
The Allroad is a great platform and I really like them. That said they are very maintenance needy. It has shown to be on the lower end of the reliability scale as far as Audi goes. I would own one but I work on my own cars so I have an advantage.
The issues are all more than likely possible to return. The timing belt is normal maintenance so it would naturally have to be done again.
I don't price cars over the site - pricing is subjective and changes from region to region so go with a site like Kelly Blue Book or similar sites and compare yours to them.
Please let me know if you need any additional information. Thank you