The most interesting part of the visit for me was seeing all the birds and all the great shopping across the street. Its a very historically important place and so close to the Kasbah. You can start off from this location and see the Kasbah
Not quite as ancient as the nearby Jamaa El Kabir mosque, this one is in my opinion more attractive from the outside and makes for better pictures if you can get the lighting right. Easy to combine with a visit to the El Kabir mosque.