I did feel uneasy renting an apartment through a private 3rd party on another continent, but everything was as described, and we had no issues. Driver appeared at the airport on time, reps were waiting at the apartment to give us keys and show us around, the place had maps and other local info. The apartment was a bit on the small side, but probably large for Taipei, and we had plenty of space. Traveled with two work colleagues, so it ended up being much cheaper than booking 3 separate hotel rooms, plus we had the common space (and free wifi) to work together at the end of the day. The building itself is a bit dumpy - don't expect and "lobby appeal", but once you're inside the apartment, it's perfectly clean and modern and actually quite nice. Location not exactly ideal (we went to the convention center each day), but it's a few blocks from the MRT, and near the best night market, so no problem. Had to send a reminder to get my deposit refunded, but after that, it came right through.

The place is OK and pretty much as expected as regard to the look and equipment, but we stayed there in January with temperature outside around 13. With no heating device of any kind the appartment was cold and humid, not in our confort zone (even for tourists from Canada!). Strangely,the shower had hot water but the bath was lacking of it, we had to boil water on the stove range to heat it up.
I would recommend the place for other seasons but not in winter.