These hotels are in Saarbruecken, the next bigger city to Neunkirchen, about 20-30 min away from Neunkirchen by direct train or by car
Mercure Hotel Saarbruecken City
https://all.accor.com/hotel/1307/index.de.shtml
Holiday Inn Express SAARBRÜCKEN
https://www.ihg.com/holidayinnexpress/hotels/gb/en/saarbrucken/scnsb/hoteldetail
Hotel Europa
ibis Saarbruecken City
https://all.accor.com/hotel/2142/index.de.shtml