I booked Heinz's place on behalf of some colleagues who were travelling to Berlin for business at the Messe.
From the beginning, Heinz was extremely helpful and very quick at responding to my questions. He advised of local amenities and was generally very friendly. The check in and check out process was great, especially as it was well out of hours.
The team who looks after the place were also very helpful and quick at responding, allowing me to do most of the paperwork from the UK, on behalf of the guys as they wouldn't be around during office hours.
I had zero complaints form my colleagues that stayed at Heinz's place so it must have been excellent as they are quite fussy :-)
Would highly recommend Heinz's place to future travelers.