Little house-fly (Fannia canicularis)
This species is somewhat smaller 5-6 mm long, and more slender than the house-fly. Its flight is notably erratic, sometime circling lamps, then flying a zigzag course through rooms. Mass infestation is rare.
In principle, this species can have the same effects as the house-fly. Primarily, however, it can be considered a nuisance that is bothersome and soils lamps, wallpaper, etc.