Hostels/Short-term housing?

I’m planning to arrive in Taipei for a 2-mo stay in August and would like to know which hostels are reasonably inexpensive (US$15-20?), clean, safe, and convenient (MRT access or easy walking distance). Looking for single room, prefer in-room wifi access. Anybody have firsthand experience? Train Station, Happy Family, and World Scholar hostels all popped up in searches. I’ll be going to class at TLI on Roosevelt Rd.
Thanks! Jackie

A site search will yield relevant tips from seasoned hostel dwellers.