Cool hotels within the periferique that offer rooms for €150 or less.
- Arvor Saint-George (9th)
- Georgette (3rd)
- Grand Ecoles (5th)
- Joyce (9th)
- Mama Shelter (20th)
- Mayet (6th)
- Saint Thomas D’Aquin (7th) – reopens November 2015
- Saint Vincent (7th)
- Therese (1st)
- Verneuil (6th)
Articles:
8 Cheap Hotels with good locations
Affordable boutique hotels in Paris
PARISNIPPON.COM 
In the18th: Maybe not spectacular or exciting, but nice – and the location is perfect for my preference for (north) Montmartre http://www.comfort-lamarck.com/
They have €75 rooms! (working link): http://www.choicehotels.fr/en/comfort-hotel-lamarck-paris-18-paris-hotel-fr326