For a concise and factual summary of what needs to be done, The University of Kentucky Entomology brief pretty well covers the subject. It still leaves a few choices to be made depending on your situation and variety of pets, but should give a good idea of what's available.
While a "guest dog" could bring new fleas to you, in all probability you already had sufficient of your own. It's almost impossible to completely eradicate them anywhere that there are animals. If there are rabbits or field mice in your yard, and even if your pets never go outdoors, it's safe to say that you pets have some fleas even if you never see one.
A more likely cause for a sudden outbreak is that the animal hosts have been absent from their usual locations for a time. Flea eggs and larvae can accumulate unseen, and will mature to the level permitted by competition from their mates. If there are no animals present, they can lurk in dormancy - with more of them approaching adulthood - until a host enters the area. With more eggs "ready to hatch" and more larvae on the verge of adult form, when a host animal reappears they all seem to just "jump out" and the effect can be quite spectacular.
A period of a couple of weeks during which animals are absent can be sufficient for an existing unnotable population to be primed for a horrific outburst. The situation mentioned above suggests the possibility that the pets slept in different places while in the care of the "sitter," and the outburst is simply the result of their return to their more usual beds - or the result of substitute hosts (you) returning to the areas where they've been dormant.