#4 Surely, if you own a large, ground-level apartment – all the basic conditions are right, there is a fenced-in garden right away and you can give your Pyrenean mountain dog the necessary physical and mental exercise during the day – yes, it would work.
#6 Having your own property is best – space is relative – the Great Pyrenees is not a dog that has to run from A to B all day – they love to be with their people.