While we enjoyed our stay in Frederik's appartment, it definitely wasn't the cleanest place we've stayed at.
There was a very nasty smoke smell in the hallway that equally penetrated the apartment, which was quiet unpleasant. And we thought some places like the kitchen and bathroom had some cleanliness issues.
Despite this, we had an okay time here ! The location is very good, communication as well and we had a nice introduction from Frederik himself to get us started.
I'd recommend staying here but definitely would say to Frederik to maybe get a cleaning crew to go through the apartment first before hosting.