€15 sounds a bit steep for the DSPCA Boarding, but like the Cattery Cottage that Addob mentioned it includes food. We have used them twice so far - once for 2 weeks and anothe for a long weekend - and we were very happy with them. He was well cared for and came back happy and well-groomed. Overall, I would say the price was worth it (for us).
I was a worrier and it was reassuring to know they have a vet clinic on site if our kitty did get sick in our abscence.