Are you interested in spending 3 weeks on a nice village in Hannover Region with very little commitments, basically feeding the cat once a day. We are a little scared she would maybe run away if there's noone in the house for longer time. In return you can chill in the garden, use pinball, home cinema and espresso machine, table tennis and hammock, do some hiking or biking in the nearby region, e.g. the Deister mountains or other nice places around.
You can use about 3 sleeping rooms, so the house would be suitable for a family, too. It would also be OK if you were here a few days in advance, so that you get acquaintaned with how everything works in the house. There's wifi of course, so you have all conveniencies. A small railway station is not far, from which it is easy to get to Hannover for cultural activities and so.
Apart from feeding the cat and caressing it a little (which is fun, she likes it), it would be nice to water the few tomato plants here and then, when it's very dry. But that's it, really. Your holiday couldn't be easier - and for us it would be a great help to know that someone looks after our cat.