First, let me say that we knew zero about Marigny when we arrived (we were even pronouncing it wrong- correct: Mar-I-Knee). We had heard from a friend that it was good neighborhood, and we found it to be a delight. Food, music, and other interesting things are within easy walking distance.
If you must to go to the French Quarter- it's a very short walk, but Frenchman Street is a very short walk and has lots to do. We also found a hidden gem behind the Cultural center called Cafe Istanbul that has a wide variety of really kooky local options.
Oh, the apartment? It was great. It had a well-appointed kitchen we used only for our first cup of coffee. It had a lovely sitting room with a TV we never turned on. The king bed was comfy when we stopped to sleep, and the bedroom also had a TV we never used.
The place was clean and well stocked with soap and towels and other items you might need some wine we forgot to drink and snacks that were useful (need a snack between other things?). Kate and Robert were communicative and it was easy to find and get in.