This was our 4th trip to Paris, but the first time staying in Le Marais which is a charming neighborhood filled with lots of shops and restaurants. Parc Royal faces a park and is very quiet, especially at night.
The apartment itself was perfect for two couples traveling together. We each had our own spacious, beautifully outfitted bathrooms. Very comfortable bed and pillows. Cozy living room with comfortable seating for the 4 of us.
My only comment is to always have your smart phone with flashlight available when coming back in the evening. When walking through the courtyard it's very dark and there aren't any lights that we noticed.