Nuremberg is a good city for mongering, although more expensive and on a much smaller scale than Frankfurt. RLD in Nurnberg is directly inside wall of the city. It is about a 15 minute walk from the main train station (leaving train station, turn left). Entrance to the RLD section through wall is at a high tower...You will see a sign for Eros 79 or something similar on the corner building.
Prices start at 30 Euro for full service, although most girls charge 50 for FS. Some houses seem to have strict rules regarding pricing, while others seem to give the girls some flexibility. Forgive me, as I don't remember which are which. You can walk from room to room, and try to negotiate.
Good news is that you can stroll from one to another, with most having no cover. The ones with covers charge 4 Euro, but I believe that is good for at least 24 hours of entry-reentry. Alternative is to pay 30 Euros for a coupon/voucher. The girls accept that the same as cash. Since it is likely that you can find a girl you like during the 3-day period of its validity, I recommend buying the voucher.
Quality is typically only average, but I have seen some top quality girls. I regret not hooking up with the hot Spanish chick that I met. I turned her down due to her not budging on 50 Euro price, but I ended up with a lower quality girl for the same price (although the girl I ended up with was very fun).
You may have to go back several times to find your ideal play partner, but you can usually find someone suitable. If you don't find anyone on your first attempt, go back later. Girls are independent contractors. so they are free to work/rest whenever they want.
WARNING - Stay away from the German girls. I have been with 2 during my visits, and each has rushed and provided sub-par service (one not even getting naked). Many Eastern European girls there, many of which provide good service. Romanians seem to be the most populous.
Bring your walking shoes, though....LOTS of stairs. Have fun, and good luck.