The pictures are accurate and the apartment is very quiet, facing into the inner court of apartments.
There is a lift within the building should you need it to the 5th floor which is just big enough for 2 people and a couple of suitcases. It is a smaller sized lift so it may struggle with big pushchairs or wheelchairs.
Muriel was a very accommodating host with great flexibility and I would highly recommend staying with her!
The location is ideal - a 15 minute simple walk to Gare du Nord, there are many cafes/bistrots/shops to explore on the neighbouring streets plus you have Montmartre within walking distance.