I stayed at Elisa's place for a week by myself and really enjoyed it. Great size for one person and the location is fantastic - really fun, active neighborhood with lots of great restaurants, bars, and shops within walking distance, plus it's close to multiple metro lines and also a block from the steps leading to the heart of Montmartre. The space itself is fine - bed is comfortable and the apartment is courtyard-facing so it's very quiet at night. Definitely a great place to stay while in Paris, I'd come back again.