Booked Alvin's place for a week when my fiance, his parents, and I were traveling in Taipei. Check in went smoothly and his wife was nice enough to give us a 5 min walking tour while we walked to the MRT together of the area; as others have mentioned, I think she (mostly/only) speaks Mandarin but is very nice.
The unit is as described and was very clean. We didn't use the kitchen much but if you plan on cooking (although why would you when theres so much food in Taiwan), just note that it is a very small, basic kitchen.
Overall the unit was great - the only small thing was that the beds are fairly hard but that is relatively common in Taiwan (hard beds) and at times it can be noisy (but again, big city, not a huge problem if you're an ok/deep sleeper).
Would definitely recommend.