Oh boy, do I ever feel your pain! I actually have a very, shall we say "macho", cat myself who also happens to be incredibly vocal (some Siamese in there somewhere) and a bit of a spritzer. Even though he's neutered, he's very territorial and quite obsessed with the cats in the neighborhood that have the gall to trespass on his domain. I'm probably not the best person to give advice on this subject but here are some links that might help or give you some insight:
http://www.catbehaviorassociates.com...aning-of-meow/
http://www.catbehaviorassociates.com...-play-therapy/
http://www.catbehaviorassociates.com/why-cats-spray/
http://www.catbehaviorassociates.com...-stressed-out/
Also, not sure if you can get Feliway in Dubai but a couple diffusers and the spray version can really help these situations:
http://www.feliway.com/uk
Does Felix have lots of scratching posts in different rooms? Using a scratching post can be a great stress-reliever for cats. I have one near most of my windows and the front and back door and when Carrot starts getting all amped up, I encourage him to take it out on one of the posts.
Calming chews (treats) that contain colostrum and L-Theanine can help relax a stressed cat:
http://www.vetriscience.com/index.ph...il&p=900781030
And lastly, any possibility that you could enclose the balcony with wire mesh so that Felix could go out there?
Good luck! Keep us updated on how he's doing (and if you have any pics, I'd love to see them. Mau's are gorgeous!!).