Me and my wife were having best time in Paris in Iona's appartment.
It's totally separated room located at the top floor. We supposed to use 2 lifts to get there, but there waas no problem with it, cause location is still perfect and in good district.
Metro is super close, and Eifel tower as well - about 15-20 min walk, which was enjoyable.
She's also let us stay a bit later , so were were able to left luggage for a bit more time in appartment.
This room has a funny toilet, and it's not one with closing door, so this place suitable for 1 person or to couple who really trust and have no secrets :)