patrick.net

http://www.cnn.com/2014/04/02/travel/gallery/most-expensive-cities/index.html?hpt=hp_c4

Monte Carlo, Monaco, is the most expensive city in the world to rent an apartment, according to Global Property Guide. The average rent there, in U.S. dollars, is $10,099 a month for an apartment that is 120 square meters (about 1,292 square feet). Click through the gallery to see other expensive locations on the list.

No doubt, I looked up some rentals:

500 euros ($700) will get you a maid's room, 10 sq m (~100 sf):
http://www.montecarlo-realestate.com/en/fiches/28119-les-dauphins-boulevard-du-tenao.html

3500 euros, 500 sq ft 1 BR
http://www.montecarlo-realestate.com/en/fiches/28804-1-bedroom-apartment-annonciade.html

9000 euros, 1700 sq ft 3 BR listed as "Family apartment on the Avenue Hector Otto - Parking and Cave storage"
http://www.montecarlo-realestate.com/en/fiches/29174-three-bedroomed-apartment-170sqm.html

These are all below the "average"!

And this is my favorite: http://www.montecarlo-realestate.com/en/fiches/26434-closed-parking-space.html (150,000 euros!!!)