Kai's home is really amazing. It was really homey and nice, air-conditioning was working fine, spacious (we had 2 rooms, living room, kitchen, and clean bathroom) - it's actually good for 12 people (we were just 6, just imagine the space).
It's location is superb - close to convenience stores (Family Mart and 7/11), a lot of delicious restaurants around (there's even a local shop selling delicious dumplings and traditional food which is like a few steps away), near Exit 1 of Taipei City Hall Bus Station (which was a heaven for me since my main mode of transportation was the MRT), near malls (ATT4 Fun, Breeze Mall, Bellavita, Shin Kong Mitsukoshi, and yes, TAIPEI 101).
Kai was very helpful from the moment I found him in AirBnB. He'll reply to any concern and he's really kind. You won't have a problem in speaking with him in English. He'll try his best in explaining to you what you need to know and even introduce to you the neighborhood. He even waited for us during the day of our arrival despite the weather being chilly and rainy, and he got us a taxi on the day we needed to get back to the airport.
Overall, my stay would be 6/5 - I don't know about others, but if you're looking for a nice apartment in Taipei where you literally have everything, or close to anything, then Kai's home would be perfect. Kai's home is not that new but I love how it surpassed time and witness many travelers who explored Taiwan before me. I will definitely stay in Kai's home when I come back to Taipei. Thank you Kai.