The Brown Recluse is a common venomous spider that we encounter almost exclusively in the house, though they are reported to live outdoors as well. We tend to find them in corners of rooms and other locations that get little disturbance. The one in the photo was hanging out in the guest bedroom shower (shortly before I cleaned the shower in anticipation of the arrival of a guest). Brown Recluse are good motivation for keeping piles of clutter to a minimum and piles of clothing off of the floor, since these locations provide them with habitat and hiding places.
In spite of the commonness of these spiders, neither of us has ever (to our knowledge) been bitten, although we have jumped on more than one occasion as a result of a close encounter.