It is slippery when wet, looks very phoney, is a mess when dirty, yes you can vaccum it and you can hose it down,fades in the bright sun it smells like tires(tyres) . slugs love it underneath, rats and mice chew it up for bedding, it frays at the edges and is murder to get rid of once it is past it's best. It was very very popular here about 20 yaers ago but not anymore.
Your friend would be better tp pay someone to keep her lawns nice and save the money of artificial grass..
Sorry to sound so negative but I have moved into 4 houses over the years that had it on the patio's and it really is dreaful stuff.