We visited for Oktoberfest, and whilst it rained the entire time it was all good here :)
The house is lovely, and there is so much room there for everyone who may wish to stay there. It is very quiet and and secluded. There is a great Rewe supermarket 5 mins walk away, and a lovely traditional German Restaurant 10-15 mins walk in the other direction (which was a life saver quite frankly :D ).
It is a bit out of the centre though, you will need to either take the infrequent train into town or a bus to the nearest U-bahn but this really shouldn't be any reason to discount it. The train station also goes straight to the airport north of the city so that should make life much easier for those travelling by plane, and goes straight to the main central station too.

All in all this place was lovely, Bärbel is an incredibly considerate host, you couldn't wish for anything better I reckon :)