4.5 stars =)
Stayed here for 1 week on business trip. The flat is located 5mins walk from the Congress centre and the Metro/RER lines. Very nice neighbourhood, pretty quiet at night, and good restaurant selection nearby.
Eskander was a very good host on check in, very fluent in English, and explained the rules, the flat, local recommendations, etc. The flat was very clean (you even take your shoes off when you enter) and had all the amenities including big TV, desk, iron, disposables like toilet paper, towels, etc. Overall the flat is a good size and Eskander was okay if you had guests over, etc. There is a small balcony as well, with seating for 2 people.
The only things which would keep from full 5 stars is that the wifi did not work in the bedroom (you have to be in the sitting room for working connection), the bed mattress is good/firm, but the pillows are thin and uncomfortable, and although it is overall a quiet neighbourhood, the walls and windows are a bit thin so you can hear other people in the building or the cars/traffic outside.
Overall would recommend, and would think to stay here for the cleanliness and great location near the Congress.