It is indeed on Guangfu Lu (广福路) in the south-west of the city. And it certainly does bear more than just a passing resemblance to IKEA!!
I took the bus there from the North, K1 or 23 to the train station and then change to number 24 at the stop right in front of the station on Beijing Lu. You ride for around 20 minutes until you get to Tai Jia He stop (太家河) and you will see Shiyi Jiaju (十一家具)about 100 metres ahead of you on the right hand side. Make sure you get off at this stop otherwise it's another 10 minutes to the next stop where you have to get on the bus back the other way, as I did due to the fact I was on the phone and not looking out of the window!
If you take a taxi, you can also say it's on 广福路 next to the 省公安厅.
I think it would be a worthwile place to go if you were really buying a lot of stuff for your apartment as they offer a free delivery and installation service for the larger goods. However, most of the smaller household items you can get in any of the big supermarkets.
The other one is behind Walmart at 小西门 as you are walking out towards 西昌路. It's much smaller than the one on 广福路 but still an alternative to the supermarkets if you want household stuff.