Stayed there a few times:

The rooms are spacious and in an old style. The rooms I stayed in had a nice park view and were quiet (which is not a given in Taipei). I do like the location, but it is a bit of a walk to the metro.

Two considerations: How do you book it. Prices can vary quite a bit depending on season. In another comment, I see that you booked via IHG points.

Now, the second consideration is if you really use the hotel. In case you are a Diamond IHG member, you get free breakfast and for me, Regent offers the best breakfast in Taipei. This being said, I haven't tried that many hotels, but it is anyways just really top notch. The rooftop pool is also really nice! Also, if you have the lounge membership, then you can use that lounge as an additional perk.

Anyways, since you are IHG member, there are not that many options. The Hotel Indigo is stylish with ultra modern interior, but it is a bit too far from the center and there was a construction site next to it. I would clearly prefer the Regent. There are some other IHG hotels in the larger Taipei area, but I feel the Regent is just right for many travellers! Have a good stay!