My girlfriend and I stayed at Blandine's between a TGV trip arriving at Gare de Lyon and a flight the next morning at Charles de Gaulle Airport.
The apartment was conveniently located with a 5-7 minute walk from Gare de Lyon, and the walk to and from seemed very safe, even when the sun went down (the area is well lit).
Blandine's apartment was very clean, and she was extremely friendly and helpful before our visit, and through our stay. The breakfast in the morning was also very appreciated.