We had the Jazz apartment and it was very nice, roomy and clean. Our family of four stayed very comfortably.
The lady at the check in counter was beyond helpful and so courteous! to be honest, she may have been the highlight of our stay there. Location was really good, right next to the train station. We walked to most places from this apartment. Although it was sometimes long, it was pleasant and we got to the places we needed to, without really feeling the distance. You can easily take the metro to everywhere but walking was nice.
At check out, they were nice enough to allow us to keep our luggage safely in lockers (since we came back past 5pm and reception was closed at that time) and to come retrieve them before heading to the airport. It took us about an hour to get to the airport from there but it was very straight forward.
Overall, we recommend this place and hope they keep the receptionist forever!