We had a wonderful stay at Jan's place. The booking was easy - communication was great and the instructions were clear. The apartment is very secure (security fobs for the door and elevator and secure locks). The place was very modern and clean - it had everything we needed for our stay. There are lots of good food options around the area (YongKang Street is one of the most famous food streets in Taipei) and the MRT is super convenient the apartment.
tl;dr: I would highly recommend this place to any foreigners visiting Taipei - it's a really modern apartment and very convenient to access the best Taipei spots.