Comillas is a charming little village. But driving and parking can bit a bit of a headache in the center. If you don't mind a walk (and wanna see the beach at the same time), then this parking lot is a good option. It's easy, it's safe and there are plenty of lots. Be aware that - as in many spanish towns - they check the meters quite often, be sure to make it back in time.
It's only about a 10' walk from here to the town center. But with lots of stairs, not a good option if you have a stroller or wheelchair, you could go the long way around though, but that at least doubles the time. But for us it was fine. It's cheaper than in the center and it's easy to find an empty spot.
There is also a public free toilet not far from here. read more