I would highly recommend Liliane’s place. The room is lovely, private and quite cosy but spacious enough for me. It’s actually more beautiful than the photos. There’s a nice window overlooking the rooftops. The weather was very hot during my stay but the apartment did not get too warm. Perhaps a stronger fan for sleeping could be good but if it it’s isn’t a heatwave you’ll be just fine. The bathroom was clean and fantastically designed.
Liliane and her partner were not there during my stay but her relatives were there to welcome me and give me advice on what to do in Paris. Liliane’s daughter and granddaughter stayed in the another room while I was there so it was nice to have others in the house at night.
She bought me a croissant and a baguette (and then just the baguette each day as I don’t eat dairy) which I could eat with spreads and coffee. I think there was fruit purée and yoghurt there too.
The area is very lively (not noisy at all from the apparent) and safe to walk around, even in the evening there’s lots of people around dining until quite late.
It’s close to the metro St Michel/Notre dame (though navigating this metro and buying tickets was a bit confusing).
There’s lots of great food and shops around and if it’s not too hot you can probably walk everywhere.
I would recommend this to solo travellers, and especially if you’d like nice company to speak French to every now and then. They also speak English.