I only have positive things to say about Guest Apartment Services. Three of my friends and I stayed in two apartments in May 2016. The apartments were exactly as advertised on the website and check-in was efficient and well-managed. I also highly recommend using their driver, Vincent. This is the first time I have stayed in an apartment (v. a hotel) because I used to worry about logistical inconveniences. However, there were none. They were extremely responsive via email and everything was delivered exactly as requested (such as the bed configuration, the driver, etc.) If you are looking for lovely properties with excellent management, look no further than Guest Apartment Services Paris.