Sphinx cafe is a good mediterranean place. The best part is not the food. The best part is the environment. They have live music and dancing. There' s a large area with pillows and such for hookah. Also late nights the place transforms into a little club environment. Now if you like those things, its a great place to go with your friends.
On the food side, it isnt as fresh as some other places. Once you start eating fresh foods, not as fresh foods dont taste as good. And I've had much better hummous etc at other places.
Again though, I'm just being picky. The food is good. More importantly the environment ensures that you will enjoy your time spent with your company. So I would go expect a good time and get one.