Budget for 8 days in Malta

I’m travelling to Malta in June with some of my family. I will be tagging along with my 5 year old boy and I’m wondering what a good amount of spending money would be for the two of us?

We have an apartment with our own pool and a kitchen so I can grab snacks and cereals for my son for breakfast but my family do love to eat out most nights.

I was thinking around 150 euro a day but as I’ve never been, I’m wondering if that would be at the lower end if we want to do some fun things.