Unless the outside is structurally ugly (like flat roofed toilet block look-alike) it can easily be given a facelift. Aesthetics are far easier to change than structural things, so that is why the inside is what is more important. Most houses can be made to look nice with a bit of render/paint job, wall art work like wrought iron hangings and some pot plants. You can even use some strategically placed colourbond or decorative brick work that you put over the top to flash it up, but that could easily go out of style.