Hi Flora
I would go for Mirage, we haven't stayed in the apartments but are booked in for next year after Angela gave us a look around them this year, lovely and clean with everything you should need with a little one, right on the beach with a fab pool and play area. We've always parked ourselves there on the days we just wanted to chill in Arillas. Always lots of children having fun, I think it would be ideal for you.
Sharon x