Small hotel, good value. Within walking distance of Düsseldorf Central Station, the reception is available around the clock. Personnel is friendly and helpful.
My one-bed room was not very big, but, again, I can't complain. I want to sleep there, not play soccer with my friends.
If you are in Düsseldorf for a couple of days and / or need to get around with public transport, get the 4€ ticket day pass for VRR at the reception. It is for the entirety of public transport, not only in the city, but in the whole region, from Kaldenkirchen at the Dutch border in the West to right up to the outskirts of Cologne in the South, Unna in the East and Bocholt in the North. Usually that pass costs in the vicinity of 20€.