We enjoyed our stay at Fralma's place, it has a great location in Montmarte, very close to the Abbesses Metro station and with loads of shops and cafes nearby. The flat is very small, basically a bedroom with a tiny kitchen and en suite attached. If you like lots of space, this won't be for you. But if you don't mind the lack of space you'll be very comfortable.
Fralma was very friendly and provided fruit, bread, some milk and wine on arrival. She was very easy to get in touch with and explained everything we needed to know.
The WiFi worked great, although we did need to reboot the router to get our devices to connect. Amenities such as extra blankets, utensils, hairdryer and so on were also provided. The flat also felt safe, there's two locked doors at the entrance in addition to the lock for the flat itself.
The only other negative I would point out is that the stairs up to the flag are very narrow and very dark at night. Although there are light switches on the way up, not all of them work so you must take care.