Latin Inscription

Hello, I wonder if anyone can help me please. We bought a Victorian building a few years ago and we have recently discovered a hidden latin inscription above a window on the exterior of the building.

It simply reads:

Parva sed apta

which I think means "Small but....*something*" I am not sure how apta translates, if anyone knows I would be very grateful to know what it means.

Thanks very much in advance!