My wife and I used the Hotel Jeanne d'Arc in the Marais district.It cost 500ff per night for a double room. We found it be excellent value. Details of this hotel can be found in Hotel Database. http://www.paris.org/paris-cgi/PDB/hotel.cgi?htl1869

Although we have not been to Istanbul, hope to one day, we have a friend in Istanbul whom we correspond with, and she recommends the 'Blue House' http://www.bluehouse.com.tr/

Regards, Richard Bloomfield.(New Zealand) ricardo