Close to Taoyuan MRT station and Z8 Exit of Taipei Underground Path/Shopping, walking distance to Ximen and other attractions.
Rooms are renovated while the building is old. Be aware that there are multiple hotels in the same building and no sign saying O2 Hotel is there at the ground floor, you only see O2 Hotel sign outside of the building.
Compared to peer hotels in Taiwan, the room is cleaned pretty well, while you may find some minor dust and slight remaining from your previous fellow guest, very very minor if you compared to the peers!
I chose a room without window, this exists often in Taiwan and Thailand, though you may not see the sun and moon, the room is kept away from street noise which I like.
Reception is friendly especially if you somewhat speak Chinese. Just be proactive when you arrive as they may not notice you have arrived.
I am happy to be back here.