1) Around hotel
There are plenty of restaurants around Green World Hotel. Especially near exit 1 of Houshanpi MRT station (~50-100 meter from exit 3). Price is around TWD50-few hundred. Most of the restaurants here do not have English speaking staffs or English Menu. You might ask them for it. Usually, the more the restaurant looks fancy, the higher the chance that they have English speaking staffs or English Menu and accept credit cards.
If you like to try some local food, some recommendations here (blue box):
deep friend chicken chop howker, Jin Xian (lunch box), Taiwan style brunch.
And some other restaurants/hawkers along Yucheng street or Tonge road.
Most of them do not have English Menu.
Or you may want to try some local food at exit 1, some recommendations here (blue box):
12 hot pot or Formosa Chang Braised pock rice (ask for English Menu).
However, if you want to spend, you might want to go to Nangang MRT station (two stop from Houshanpi station, < 5 minutes) for better dinning experience. Above Nangang station is a shopping mall, go to 7-10th floor (TWD600-1000) or food court at basement (TWD100-300). Most restaurants at the shopping mall accept credit cards, with English speaking staffs and English Menu.
There are a lot of restaurants inside this shopping mall, especially 7-10th floor