I would absolutely recommend this place for a short stay, with a few caveats. It's in a lovely quiet part of Ximending, but not the closest to the metro station - still about a fifteen minute walk. It was fairly clean, but there are ants (not too many ants, and in Taiwan it's hard to avoid, but if this bothers you then you might want to look for a hotel instead). Otherwise, very comfortable, great desk for working, and very effective AC (vital!) Mark was also very helpful and communicated well.
The main issue for me was that it's not really set up for longer stays. I stayed for a month, and I was only able to exchange bedsheets for fresh ones once in that time. Also, there are no cleaning products provided, only a dishwashing sponge, so I had to buy things to use to clean the bathroom (and I wished I had a broom to sweep the room with). Fine for a few days or a week, but for a month, I would choose somewhere else.