One, Andrea and Alessia were amazing. So helpful and informative. Take advantage of their knowledge and definitely have them hook you up with Luigi for any transpiration.
Two, the apartment is stunning and unique. I loved staying and would return in a heartbeat. Now the stairs, yes it may seem daunting but they are manageable and become easier after your first few trips. Plus the staircase is a marvel and I often found myself distracted by its beauty that I didn't even notice all the stairs.
Three, highly recommended!