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Same here (definitely rats!), they even wake me up at night as the sound is as loud as a human scraping the wood with a chisel.
Apparently they found their way under the old wooden floor from the front yard, it's been more than 2 months that we hear them and we found isolated traces of presence in the house, but never got to see one or understand where they come from.
Pest control came and filled every possible floor gap with wire wool, but that doesn't stop them from getting under the floor boards...
Not sure what to do apart from moving somewhere else.
Breso-
Have you seen them? I think mine may not be rats because of the small size of their shit. I still haven't managed to spot any with the endoscope though. It's a two-person job: one person to look at the screen, another to manipulate the endoscope. My girlfriend has limited appetite for either job. So far I've seen more shit, that's about all.
Sharkstar
I dealt with the mouse, not in the best way. It appears now that we have rats in the ceiling. Much noisier than mice, they make a loud scrabbling sound at dusk. I've bought an endoscope to spy on them but I know they are there because when I change the LED downlighter in the ceiling droppings fall onto my face. I saw the film Sicario recently and it has given me a sense of how I am going to deal with them.