I loved staying at Juliette's. The location is fabulous, about two blocks from the lively square and church of Saint Germain de Prés. The street is very calm and the neighbourhood is perfectly situated close to many sights, just go a few blocks and cross the river for The Louvre, Notre Dame, Le Marais etc. If you are into shopping, you have plenty all over. Cross the street from the church and walk some blocks down and you have some very charming restaurants, I can recommend the lovely and relaxed Pizzera Positano.
The apartment is in the courtyard, and you will find it after climbing a winding and narrow spiral staircase 5 floors, which I found adding to the whole experience, but if you have any problem with walking stairs, or are bringing big heavy luggage maybe reconsider this as a place for you.
The studio itself is very charming, VERY bohemian, be prepared to take the shower just squeezed in between the zink and the wall and live a bit like an art school student. The view from the top floor is really sweet to wake up to. I slept very well in the bed.
The toilet is in the corridor a few steps from the studio.
For me, staying three nights it was perfect as I love the area and to get the parisian atmosphere.