I can not think of a better place in Paris for a family or a few friends. It has easy access to Paris hot spots and is a relaxing space to come back to in the evening. Several markets are close by, and I would recommend Monoprix it has everything you need from groceries to alcohol, a bakery, and clothing and supplies you may have forgotten.
The bus stop is just out front, the subway is out front with elevator access for those that require more assistance, and a cab stand is about a block and a half to the right near the Pantheon.
Security is excellent, with two locked doors before you even enter the apartment building. An elevator accesses the apartment’s 5th floor, and a flight of stairs leads from the entry way to the living space. There are plenty of bathrooms and the kitchen is fully equipped for any cooking needs. Be careful going up to the top deck area or looking out the windows from the living room or master bedroom. You may never leave the Flat. The view is much better than the pictures can show.
Luxembourg park across the street has a crushed stone running path through beautiful gardens and a pond area to sit and relax or picnic. Kids playgrounds are close. There is great shopping with local craftsman in the area. I have been to Paris before and do not think I could stay anywhere else in the future. Happy New Year 2019 and thank you to our hosts!