I really enjoyed my time staying with Sven and his partner. Sha Tin turned out to be an excellent location, despite not being the most downtowny. The room is small but the space is used efficiently. I really have no complaints about the apartment except for fairly slow Internet connection.
Note that I was traveling alone; for couples this particular room may or may not work as well but I believe Sven rents out another room in that apartment (and across HK).
Sven personally is really nice, helpful and proactive. Ask him about cycling in the area, Hong Kong has excellent cycling venues near Sha Tin!
There's a very good chance I'll stay with Sven again next time I'm in HK.
Thank you, Sven!