there is a blue hole in the roof

Could you check if this hole appears in version 2.2 too?

the top of the roof is too bright

The shininess set on the roof object must be too high. You should edit the MTL file of this object and reduce its Ns and Ks values.
Caution: don't change the color of the roof afterwards because changing the color of an object sets its shininess to 64 (shininess may have a value between 0 and 128).