Ikea
Ikea, near the end of the 14 route, is famous for cheap flatpack furniture, but also has a huge range of kitchen equipment, haberdashery and bedlinen, mats and rugs, and other household requisites much cheaper than any other shop I found in Uppsala. You can equip an unfurnished apartment entirely from Ikea (and I did!).
Ikea is big, which isn't a problem if you're only buying small items that you can pick up and examine. However, if you are buying large items (beds, tables, bookshelves) with options (like different colours) that are not on display, it will take you a long time to work your way around it if you don't speak Swedish and have to translate stuff one word at a time with a pocket dictionary. I visited Ikea 4 times before I bought anything.
Many of the staff have flags on their nametags, indicating the languages that they speak, usually English, French, or German, but even the staff without the little Union Jack often speak English.
Getting There
The most convenient way of getting to Ikea is to get the 14 from Hallplats H (“Bus-stop H”) on Dragarbrunnsgatan, just near the junction with Påvel Snickares Gränd.
Delivery Service
After you have bought your stuff, wheel your trolley(s) out the exit, turn left, and go to the Byten & återköp (“Exchanges & Returns”) area outside the main shop — it is at the very opposite end of the long sheltered area from the entrance.
For delivery within Uppsala, Ikea's Transportservice costs between 525 and 575 SEK (€60 to €65), depending on when you want delivery scheduled. The cost is independent of the amount delivered, and expensive enough that it's worth organising yourself so that you only have to use it once. If you want something delivered the same day as you buy it, you have to get to the counter in the “After Sales” area before 2pm, IIRC. I've queued there for quite a while (they already have your money at that stage!), maybe as much as 30 minutes.
Cribsheet
It will help you to have particular vocabulary in Swedish just for Ikea. Because of the labeling, you'll quickly cop on to the words for major items: matbord means “kitchen table” (lit. “food table”), bokhylla means “bookshelf”, and so on. You'll also want to know basic colours in Swedish to understand things like “also available in blue, green, and white”, and, for the same reason, things like ek (“oak”), björkfaner (“birch veneer”), and massiv (“solid”) to name but a few. I found a few words and phrases in Ikea that weren't in my pocket dictionary, for example avtagbar is “removable”. I recommend that you write them down on a cribsheet so that you don't have to keep looking them up in your pocket dictionary.