Marc was so extremely helpful with the check in process! We were due to arrive on a Monday afternoon, but after a fiasco at the airport our flight was cancelled and rebooked for the next day. Marc was so flexible, and arranged for someone to meet us to let us in after we arrived.
The flat is small (like all the other reviews say), I would say comfortable for one person and a little cozy for two, but nothing overwhelming. My fiance and I had no difficulties with our larger suitcases and getting ready around each other.
A few pieces of advice I would give future travellers...
When taking the train back to the flat, leave the station by the Auber (pronounced 'ooh bear' if you're curious) street exit, its maybe a 5 minute walk away from the flat. On our first venture out we left the station through the opera street exit and our tired feet had already had enough walking for the day.
When you get to the flat, there is a small elevator (max 3 people, or one person and a suitcase) to get you to the 5th floor, but there is still one staircase you have to climb. So don't pack you suitcases too heavy, or it'll be a pain to haul them up.
Most importantly Beware of mosquitos!!! On our first night we left the window open to cool the room down, we thought nothing of it, and I woke up in the morning to 26 mosquito bites (you might think I'm exaggerating, I assure you.. I'm not). Bring bug spray, leave the windows closed, kill all the mosquitos.
Other than the mosquitos it was an amazing place, very close to transportation, comfy, cozy, and had everything you could need for a stay. We would stay here again in a heartbeat if we got the chance.