Of the three budget chains, I'd always choose Ibis over Premier Inn (2nd) and Travelodge (3rd). Free wifi, more TV channels and generally better designed rooms.

There's one in central Glasgow at 220 West Regent Street G2 4DQ. Hotels.com has loads of dates in January for £35, plus you can get dependable cashback with Quidco. Book at least 14 days in advance for those rates.