I lived just north of Dus, in Ratingen about 10 years ago (relocated by employer). Don't bother with Dus if you will be working out of Koln, Koln is far nicer and nearer the hills, and the traffic around Dus is a nightmare.
And you probably already know that Germans are tight, so ignore they pfenig saving options. We rented a house, when colleagues rented flats – we paid the same as we paid in the UK, but ended up with a huge house in a really good area. Yes we could have saved, but there was no way I was living in a flat with kids.
Also if your employer is still paying you out of the UK investigate whether the NT tax code still works – basically No Tax – and works by your employer paying you in the UK but you not living here (limited to x days) – plus you don't pay German rates as you don't 'earn' there.