As a borrower, you must also cross check with your bank whether you are allowed to fix your interest rate for the entire loan tenure or only for a few years. (housing.com)
One must cross check if the preferred insurer has imposed any waiting period, or introduced a permanent exclusion so that there is no hassle at the time of filing the claim. (policybazaar.com)
Interesting and very detailed article, the overall German rental market is well managed so the reports the companies produce allow some degree of cross checking yields etc as detailed in the reply above. (wexboy.wordpress.com)