I stayed at Apartment 10 just off Wenseclas Sq. The apartment is well renovated with OK decor (think reasonable IKEA). Kitchen was good, bed was comfortable and there is plenty of space.
Registration is terrible, we were told you only have a 2 h window 3-5 pm to check in and when we went before that the office was locked, not sure where the 24 h service is? Also, when you ask questions they do not get back to you.
Apartment is a 15 minute walk from the registration desk, then a four flight walk up stairs, so this is not for the old or unfit. I thought I signed for a room with AC, but apparently not and when I called reception they thought that was correct and then changed their mind. It was very hot in the apartment and we had one ineffective fan for cooling. I did ask for more but was told they could not be supplied. Also you do not want to leave the windows open as it is noisy at night despite us being warned we were in a residential area and to be quiet.
Also to reach the apartment you have to walk past some totally nude bars and clubs where there are always people around. It did not feel unsafe but not for the sensitive.
Overall a nice apartment for the winter but I would not stay here again.