First, I would want a complete list of the labor that has been done, a complete list of all parts replaced, a list of everything done associated with the TB and Turbo, and the name of the mech who did the TB. IF I was still interested, I would check it in person, drive it, inspect it top to bottom & front to back. Then, run a VCDS scan, and look at having someone check compression, etc.
I think the pix look nice, but that's really pretty secondary. I would pay above average asking price for a car whose owner is TDI-centric, keeps great records, uses a TDI mechanic connected to TDIClub, and maintains the car 100%. I would not pay a dime extra for his addition of power heated leather seats, leather 4 spoke wheel, leather (front only) door cards, remote car starter, or any of that jazz. In fact, the oil changes every 5kmi might even steer me away.
Let us if you go and see it! G/L