511 Place d'Armes is a type of apartohotel without a lobby. The access is very easy and safe with code to the doors. The location is unbeatable right in front of Notre-Dame Basilica. There is a parking on premises but with height restrictions we had to park at 235 Rue de l"Hopital, a very convenient and secure underground parking, an easy 2 min walk from the hotel. The premises at 511 Place were immaculate. We had 2 bedrooms, each with an ensuite bathroom, a full kitchen, living room, dining room and a laundry. The hotel is situated in an old bank building but the apartment was beautifully renovated. Just around the corner is lovely creperie Maison Bagatelle.
I would strongly recommend this hotel.