Maybe I'm a bit biaised, but Ai is typically one of the best girlfriend/love of your life type you can get.
Some would consider that it could be boring in the long run, because everything seems too quiet and peaceful.
That would be forgetting the little mischief she had here and there. She seems playful too at times and there are hints her intimate behavior would be both beautiful and hot.

As you read I'm sold, maybe because she ressembles so much, on many aspects, to someone very near, someone I share my life with.
Or maybe I'm only seeing that character with applying that model and forgetting the things that do not fit.