Limos in Athens are not the usual long limousines with sofas, champaign, etc. They are much shorter, usually the luxury series of Mercedes. However, you can let the limousine company know about your request and they may be able to arrange something for you.
If you wish to hire a limo for your transfer from Athens Airport or if you wish to book a limousine during your stay in Athens you can contact one of the companies below.
www.welcomepickups.com
www.athens-limousine-service.gr
www.centralvip.gr
www.athenslimouzine.gr