Hi,
Oman is a beautiful country. I'm sure you will love it.
1) Ayana Spa,Bliss Spa,etc
2) Muscat beauty Salon, Dessange,etc
3) Try Tips and Toes( not sure but they do give the best pedicure and manicure)
Well yes it's a bit far. So try the interchanges.
Well MQ has more social connection areas compared to The Wave.
About the villas check out the local newspapers or Facebook what's happening Oman? Forum
Hope this helps :)