My apologies for the hot water problem, sometimes when previous guests use up the hot water it takes just too long for the heater to warm up again. I will make sure to find a solution for the problem in the remodeling of the apartment, thanks for letting me know!
Thanks for the nice words Gie! :) I am happy to let you know I have found the cause of the hot water issue: The water heater switches of during the day, and the reservoir of water is heated using the cheaper electricity at night. Apparently, the hot water had been used up for that day.. Thanks for mentioning it, I will make a note in the house manual!