To be honest, it is somewhat claustrophobic for drivers used to driving in Tahoes and Suburbans, but it is livable.
In terms of the backseat, it is purely there for looks. Unless you have no legs, or are less than 4feet tall, it is virtually useless.
The seats are very sports-oriented making the drive not per say comfortable, but very supportive. Is it easy to drive? With the convertible top, blind-spots are present, but park distance control will somewhat resolve the issue. Other than blind-spots, the TT is very easy to drive and easy to hit triple digits; not the best car for inexperienced drivers.
Good Luck