The apartment is really great though it's quite small. But it was very clean and the host left a lot of stuff (including food) for us. The location is great as well: only a 5 min walk to the nearest MRT station, 10-15 min walk to Yongkang street with lots of places to eat, and there is a 24h supermarket nearby.
I would definitely recommend this apartment to anyone who wants to stay in Taipei for a week or so, though it's best suited for couples.