The stay at Patrick's appartment was wonderful.
Patrick and his co-host Olivier arranged for a private driver to pick us up from the airport (60€) and who waited even though we missed our intended flight and arrived an hour and a half late.
Upon arrival Olivier took our heaviest suitcase and brought it all the way up the 5 flights of stairs (which can be a little tiring, especially after a night out in town). We were shown the appartment which was just as advertised. It is a small but lovely apparment just under the roof of a classic Parisian building. It is well secured with 2 independently code protected front doors (and 5 flights of stars that should ward off any unwanted intruders :D ). The appartment is well equipped and the furniture is modern and chic. The bathroom is large enough for two people and includes a large shower and a washing machine.
One of the best arguments for this apparment is undoubtedly its location. The St. Germain de pres area is full of restaurants and cafes, the river Seine where one can take a bottle of wine to in the evening and enjoy it with lots of young people from the area is only 100m away and typical sights like the Louvre, the Pont Neuf and Pont des Arts, the Notre Dame or the Jardin du Louxemburg are all within immediate walking distance. During the night the area, though lively, is calm enough to easily sleep with the windows open.
Oliviers recommendation for a nearby restaurant (Le Christine in Rue Christine, ca. 200m from the appartment) offered the best food we had during our trip and I recommend it for anyone who is in the area (make a reservation!).
All in all we could not be happier with our trip and with the service provied by Patrick and Olivier. The contact was great and friendly and I strongly recommend this appartment and will book again should I ever plan on going back to Paris.