I escorted 57 people to Trier for their Christmas markets and I found the Residenz am Zuckerberg with the help of the Trier Tourist Board.
Excellent value and not one of the 57 people had a complaint. The room is more like an apartment and it was spotless. The staff is more than helpful and the location is a 4 minute walk from the Marktplatz. The breakfast is great and you can't beat the price. I have to say also that the bed was the more comfortable in Europe and I have travel everywhere.
The street is quiet and I would definitely return.