Are the legs noticably spikey? If not, it's just a common grass spider. Very easy to confuse with a wolf spider if you're not familiar with the various species. One of the big give aways is its abdomen which is thing and drawn out unlike the various wolf spiders.
Like the wolf's, it's venom is not generally considered dangerous to most people.
As someone mentioned above, this time of year it's pretty common for insects to start looking for somewhere warm and safe. I'm finding all kinds of shit in my house, too. I always find them in the same spot to the left of where I sit on the couch. I believe it's due to the variouls aquarium, etc lights that seem to converge on that spot on the floor at night. It seems to eventually attract all the wild bugs running around at night. lol I have a bug catchin' container I use.
If the gf isn't paying attention, I'll let some bugs live just to help rid my house of the possibly harmful ones I miss.