A very nice apartment just near the central station. We were 5 in number (a young couple and three ladies) and everyone felt perfect. There are three bathrooms in the apartment and three AC, which is fantastic!
Another point is that the guests have to be very careful with the electricity - it's a rather old house, so if you plug every device and turn them all, the electricity may be knocked off.
Anyway, I would definitely recommend the apartment for big groups! :)