We stayed in this city centre guest house called Adelaides:-
http://www.adelaides.co.uk/
It's a converted church, really clean, nice people, only £50 per night for a double. We found it in the lonely planet online - more options here:-
http://www.lonelyplanet.com/worldguide/destinations/europe/scotland/glasgow/sleep
In case anyone's not driving to the Ikea store... You take a bus to Brae Head Retail Park from either the main bus station or Renfield Street, adjacent to Central Station. The busses are as follows:-
Ariba:- 21, 23A, 101, 517, 522
1st Glasgow:- 22, 55
Gibson:- 21A, 68
We found the 1st Glasgow the most efficient - a 25 minute journey from Renfield Street to the Retail Park, while Ariba are much slower, with a longer route. But they all get you there in the end. Busses are infrequent on Sundays, so be sure to check the timetables. Also, Ariba's exact change only, while 1st Glasgow gives change.
Once you get to the retail park terminus, it's a short walk to the Ikea store.
I agree with Peanut that it's much better to see the stuff in person, and Glasgow's a good place for a weekend break - it's a little rough around the edges, but the people are really friendly and there's lots to do and see.