Quick update: I just booked the same hotel again for my upcoming quarantine after returning to Taiwan next month. Price still NT$ 2500 per night.
The more I kept looking at these more expensive choices, the less happy I felt paying 50-100% more for what in the end could be a comparable or even less pleasant experience. Probably better to „suck it up“, order delivery frequently, save some money and try to get it over as fast as possible.
Now hoping that I will again get a room with a big window that opens and a the work desk will still be fine. And of course, there is always hope that they improved the food a bit by now 
And of course there’s still the risk that CDC suddenly puts Turkey on the list of high risk countries and I need to go to the government quarantine facility. Then that cheap flight over Istanbul could still get back on me…