I like Safranbolu quite a bit. They have not-particularly-appealing specials at lunch (11:30am to 1pm?: but just slightly cheaper versions of their more basic mains). They've got set meals any time, which I do recommend: I believe it's add 300 for soup, drink (ayran!), appetizer, and dessert. Well worth it. I've found it's a place where if I try to keep the bill low, I don't particularly enjoy it, but if I splurge it's a great meal.
Plus it's a nice-looking restaurant inside. Nothing spectacular, but it does make you wonder why so many Taipei eateries are ... less nice.
Facebook link: https://www.facebook.com/safranboluturkishrestaurant