Adequate if you need to fit 3+ people and stay near the main station for a short period.
Pros: Convenient location, spacious room (but we were asked to pay extra if we wanted to use both beds), responsive and courteous host (never met Sean in person. When we got into the booked room, it was very dirty. Sean was quick to respond and direct us to the purple room within an hour)
Cons: The purple room has old amenities and furniture. The bathroom was not the cleanest (hair on the floor, frayed shower curtain, mold in some spots) and the toilet seat doesn't stay down.
The 5-star rating was mostly from older reviews so maybe it was nice at one point? Our other Airbnb stays in central Taipei were cheaper, cleaner and more pleasant.