Kai's place is a great choice, especially if you want to be away from the overcrowded touristy areas. The bus can get you to the major sights fairly easily, but there will be a decent walk or commute depending on where you're going. The neighborhood is adorable with lots of family-friendly restaurants and shops. Our one big issue with the place was the wild pack of dogs that sleep just across the street that bark ALL NIGHT LONG. Some nights were better than others, but make no mistake there was barking during our entire 5-night stay.
Kay (Kai's mother and our main point of communication) is lovely and was able to guide us on some tips for getting around, sights to see, and restaurants to try. She came in clutch when we had a dental emergency on new year's eve and needed immediate treatment. Not only did she suggest some dentists but also called and made an appointment for us. Her communication and willingness to help us in any way possible were not unnoticed.