Hi, if you want to live like a local I highly recommend Colombe's flat. It is in a lively area that has restaurants, grocery stores, take-away and multiple metro stops. It's about 30 minutes walking time to Notre Dame or you can hop on the Bastille or Voltaire Metro stations to go even further.
The apartment was huge for Paris and my friend and I had a lot of room to move around. There is a nicely appointed kitchen with stove and dishwasher, refrigerator &freezer, dining room table, separate shower and toilet, master bedroom and washing machine.
The bed and sofa bed were super comfortable. There are no curtains (which we knew) so if you are on the sofabed bring an eye mask.
You are 5 flights up (again we knew) so just take that into consideration if you have mobility issues or a lot of heavy luggage.
There is a nice patisserie at the end of the block and a large Monoprix 5 minutes away for daily needs
Colombe was super responsive and helpful before and during the trip. We arrived early and she made sure we could drop off our luggage before check in. We loved the ambiance of her apartment. We always felt safe walking around.