First for the pluses: the minsu hostess, Lisa and her son Little Boss (Xiao Lao Ban), are extremely approachable and hospitable hosts. Lisa replies to emails promptly and will assist you with any enquiries where necessary. Although she did not help us with the laundry personally, we could use her washing machine without any additional charges. The minsu is also located in the city centre, about 15-20min from Ziqiang Night Market, which has tons of good food without the long waiting times at other night markets e.g. Shihlin. Lisa also arranged a Taroko Gorge tour which was cheap and good (2200NT for 2). The driver, Leo, speaks good English and will address your requests readily. Last but not least, 1000NT for a big ensuite room per night is an absolute steal.
Downsides: there are no lifts in the minsu and you will have to carry the luggage up yourself (for us it was the 4th story). Lisa only provides transport to the train station and not the airport, so you would have to take a cab there. Fortunately, she can call a cab for you and it will pick you up when you are ready. There is also no breakfast provided, but there are good breakfast eateries around the corner.
All in all, the experience was great but perhaps not spectacular, but we are definitely not complaining for the great discounts we enjoy.