I would highly recommend Cristina and Matteo. I had not been back to Paris in four years and booked Cristina's studio for three nights of while in town for a conference based on A) location, B) her ratings, and C) the fact that it was both affordable and private. It did not disappoint on any of those counts. The flat is close to a Metro stop and off major avenues (which comes in handy for late-night cab rides), close to many restaurants, and very cozy. Cristina was very accommodating, generous, and warm; Full of helpful advice. I had forgotten a convertor and she let me use one to charge my Apple and even brought up tea for me! Whether traveling alone or as a couple, this is the place to be. I'm sure its beautiful in summer. Enjoy!