Apart from the wifi being broken for our first couple of nights and some communication issues around that, my girlfriend and I had a wonderful time at Nathalie's apartment. It is spacious, comfortable, and well equipped, and we enjoyed watching a DVD every night while lying in bed!
Location is great, only a short walk from everything. Even though you can walk pretty much everywhere in Stockholm, if you want to take the metro, the station is only a 3 minute walk away. The area, Kungsholmen, is mostly residential but has lots of restaurants and cafes. The pizza place on the corner is very good, and very reasonably priced. There is a supermarket around the corner as well. We were very happy with the location.
The shower was a little bit annoying as there is nowhere to hang up the nozzle, but it is no problem if you want a bath. Also, the bed is actually two single mattresses side by side, which was a little drawback, but both of these things are pretty minor. All in all we would definitely recommend this place!