This small budget no frills hotel is well located several minutes walking distance from Montparnasse train station, and subway Pasteur is literally at its doorstep. (The Paris subway is user friendly despite looking like a horrible mess on paper)!
My room was very basic but clean and comfortable. The reception staff were friendly and helpful offering touring, safety and dining advice. Many dining options within minutes walking distance. And all major tourist attractions are easily linked by the subway.
This was my 2nd time in Paris. It still remains an expensive city to sleep in. The dollar or euro doesn't buy much Paris accommodation.