We stayed for one night. Unfortunately, we didn't meet Martin during our stay, but communication via Whatsapp was easy and fast and both check-in and check-out worked out without any problems. The location of the apartement is great; it's not super central but a beautiful region of Brussels and getting into the tourist craze was easy (2,50 euros by bus per person). The apartement is nice, too. Very clean and has everything you need. We would come back here!