Just came across your message posted early in the week re: taking a baby. I really hope your friends are still going, they will have a wonderful time and so will bub.
Having lived there also I highly recommed the BIMC. They were always fantastic and I felt reassured that my girls were going to be fully checked out.
With the child only being 6 1/2 months I would recommend they take their own food. That way there's no major change in their diet. My daughter was teething at that age and loved to chew on frozen mango pips. Nappies from OZ are also much cheaper and far better quality, it the child is big enough a pack of pullups is a good idea, as there aren't too many places to change a baby if you go out. I've had a few bad experiences at Galleria with stinky nappies !!!
I had a microwave, but if we went to stay somewhere, I'd just use the good old miltons tablets. Oh and take some Panadol & Pedialyte that way if they need it, there's no stressing about going out to get it. Tell them to have a great trip.