I had a lovely stay at Helene's apartment. It was very centrally located, completely quiet at night, and convenient to the metro and bus stops. Helene made me feel very welcome, printing out information on how to get to the airport and providing maps and other information. There is a small elevator in the building that's good for bringing up luggage. The wifi was a little spotty but overall worked fine. A good choice for a single traveler in Paris.