Sunny's place is located in quite a good location, about 10 minutes walk from Ximen Station. Ximen station is near many famous attractions in Taipei, so it saves your travelling time. There are several restaurants under Sunny's house as well, and Ximending is within a walking distance. The apartment is small and cozy, providing almost everything you will possibly need for your stay.
However, be warned that the bed for both bedrooms are very firm. My parents that came on this trip with me has complained a lot to me about how firm the bed was. In addition, if you have several pieces of heavy luggage, the number of stairs to the apartment is not to be underestimated. We lived on the 6th floor for our trip. At the entrance beside 7-11, you will first need to climb a flight of stairs to the 1st gate with a lock. After entering that gate, there is another flight of stairs to the lift. After taking the lift to the 6th floor, there is another flight of stairs to the 6th floor(the lift stops between the 5th and 6th floor, so you have to climb up). The amount of stairs is totally bearable during your everyday in and out sessions, however if you are handling many pieces of luggage, this is something to bear in mind.
Overall, it was a pleasant place to stay.