if a property is listed as sleeping 6 there should be more than a single set of keys.
what made the single set of keys particularly atrocious was the fact there is a master door on the ground floor, a common area hallway door on the second floor, and then a third door into the unit.
this single set of keys meant if my parents wanted to go somewhere else from where I wanted to visit, or if my spouse wanted to take my daughter somewhere ... every single trip needed coordinated for timing. It wasn't enough to have one person stay home and buzz in the others, whoever had the keys had to be there first & had to be online to communicate with all other members.
the spot was somewhat small inside for my 5 year old daughter, who really enjoyed a nearby aparthotel which was easier to walk around without bumping into each other. this was a bit meh by comparison, whereas the single set of keys led to us booking a second hotel to avoid the stupidity of 1 set of keys for 5 people.