Yes it will work fine for domestics , for best results you need to replace the 38mm hose with 51mm.
You often get people on here saying it won't work when they have not even used it.
The suction power and airflow are the important figures .
The nilfisk has high figures compared to other 1800 watt vacs and matches or exceeds some 2400 watt vacs .....its not just about wattage , it is also pretty durable , been using mine for around 18 months and still going strong .
I have used it unto 3rd floor and once on four story and has done the job , for domestics it is perfect really .
If you are regularly doing 4/5 story work i would spend the extra 4/500 quid on a big super duper one .