Don't look anymore. You've found it. The flat is so lovely and tastefully decorated. Excellent location 1 min walk from the Metro and some 10 min form l'Isle de la Cité, on a lovely bubbly ancient cobbled street with charming cafés, nice cosmopolitan restaurants for all food tastes. Just down stairs boulangerie selling the best freshly baked baguettes I've ever had and delicious pastries. Five minutes up the street la librarie de voyageur has a very good selection of french and international literature... and if your ears are a bit sensitive for the nearby bells of St. Medard take earplugs with you. I read somewhere that he was generous even with lazy people (I knew there would be a saint somewhere I could entrust myself to! Of course, I paid him a visit). Needless to say the flat is impeccably clean and Sonia seems very proud of doing a great job.
Valerie is adorable. She really is. Excellent communication, couldn't be more helpful and welcoming.
Impossible not to recommend this unique place. Best ever few days in Paris! Wouldn't stay anywhere else on my next visit.
Many, many thanks Valerie. (Would you consider selling it to me?, please)