Galathee's flat is in a great location, opposite the Sorbonne and a Metro station, and within easy walking distance of lovely neighbourhoods around Place de la Contrascape, St. Etienne-du-Mont, Odeon, Notre-Dame etc. It's not all that far to walk to Musee d'Orsay, Pompidou Centre, Louvre etc either but with the Metro stop opposite and bus stops around, there are lots of options.
The flat is very clean and warms up quickly on colder February days. Although it's on the fifth floor, it's worth the climb for the views from the stair into the lovely courtyard and from the flat across to the Sorbonne.
It's a very comfortable flat - the shower's great, the water's hot, the bed is comfortable and there are plenty of towels provided as well as an iron, kettle, fridge and two-ring hob. Despite being quite close to many Parisian sites, we found it very quiet. A great place to stay!