Many have stayed at Bardis Sun, and in all my time on the forum I have never heard a bad word about this accommodation. I can answer two points - the pools in Arillas are all open to everyone. It is just common decency to buy a drink at the bar and be sociable to the owners. We often spend a day in Mirage, Kaloudis, Anna's, Rainbow etc just chilling by the pool and enjoying the company.
As for baby seats for the transfer, book with Arillas Car Hire (Kostas or Theo Krasakis) and ask for it. No problem. You can link up on the forum, but if you want to phone, send me a PM and I will put you in touch.
best wishes
Phil