We were with 10 girls and absolutely loved the appartment. Spacious, clean and light. Beds were good and there was enough room for all of us and our stuff. Location is a bit further from the places we went to but there is an easy connection to the metro station.
Communication was very easy and fast. Check in and out works with a code so every person in our group could enter and leave easily. After check out there was the possibility of leaving your luggage in a store room.
And finding bubbles and chocolats on the table always is a good start of a trip. Would absolutely reccomend this appartment to a group of friends or families!