I stayed with my daughter and husband and there was plenty of room. The apartment is very unique and chalet style. Parking was available which was a nice surprise. The castle and downtown are steps from the apartment. The owner's daughter greeted us on arrival and the owner showed up shortly after with a fresh carton of milk, no less. We were left to our own devices and it felt like a home away from home. Heidelberg is a beautiful city. Although busy it is not over run by tourists. The prices for museum and castle tickets are extremely reasonable as well.
Thank you to Volker and his family for an enjoyable stay.
BB & MR