Ooooohh yes, they're common "here" in Edinburgh too - heaven knows what they're squelching through while we're on holiday
Indeed, good housekeeping is the most effective way of deterring them to disturb their would-be lairs.
Not a good flatmate for pianists either
When buying a piano it's one of the basic things to check - the green felt washers for example under the keys are one of the attractions. Revealing these by removing the front rail can show neat little collections of eggs the size of a pin-head, bearing the colour of what has been eaten!