Stephanie's flat is really spacious and the views are incredible. The 6 floor walk up really shouldn't deter any travellers who are able to climb stairs, as it's really worth it the sunrises and sunsets over Paris! There is street noise when the windows are open in the day, but it dies down at night anyway so we slept very well here.
The photos aren't completely accurate in terms of how the flat is furnished now, but it's still really lovely! I felt very at home here.
Be aware that this is an old building, and there are small problems that can pop up because of this, but with that knowledge, I definitely think it's worth staying here.
The location is incredible, you don't feel like your in a tourist area, while at the same time being incredibly well connected and within walking distance of a lot of great areas of Paris.
One side note would be that the wifi internet is spotty (in our case didn't work at all).