I have crickets on my patio. A check on the internet leads me to think I have crickets in the house, as well, but except for one that came in through the patio door, and therefore doesn't count as an intruder, I haven't any evidence that they're inside.
Crickets are noisy little crispy animals. They chatter (males only apparently) incessantly. I used to find that charming. I am less charmed these days. My other neighbours with the same ground-floor configuration as ours are happily unaware of, or even more happily unburdened by, crickets, which seems totally unfair and even more totally unlikely.