We stayed at Apostrophe Hotel from 29th to 31st January 2012 and throughly enjoyed our stay.
Everything in this hotel seems to be done with love and care. The rooms are beautifully decorated around different themes, everything is very clean and the staff at the hotel are lovely - nothing was too much trouble. They provided tips about where to eat, how to get to the sights we wanted to see and even made a dinner reservation for us. We had breakfast in the hotel both mornings and enjoyed it very much. This included freshly squeezed fruit juice that the staff had made that morning. It's the little touches that make the difference.
We stayed in the Paris Paradise room which is on the top floor of the hotel with a view out over the rooftops of Paris and the Eiffel Tower in the distance. It really is stunning to see it all lit up at night. The bed in the room faces the window so you can wake up to a view of the Eiffel Tower. As has been mentioned in other reviews, there is a jacuzzi bath in the room itself so if this doesn't appeal then choose another room (other rooms in the hotel have three way directional showers).
The hotel is well situated, around ten-fifteen minutes walk from St Germain which is a nice area to stroll around. There are lots of little independent boutiques and cafes in the area and it is close to Palais de Luxembourg. We found it to be very quiet in the hotel at night and didn't hear any traffic noise at all.
We had an absolutely fantastic time when we stayed here - in fact, we're planning when we can go back!!