We had a great stay at Gret's studio. She was very accommodating and allowed us to check in early since the unit was available. She sent us to St. Catherine's Square for moderately priced meals and we were there several times during our 10 night stay. The vibe at the various cafe's was lively and it catered to a mostly local clientele.
This is a commercial storefront that she converted to a bnb in a very very quiet side street in the Marais. It is just steps away from the Picasso museum. The St. Paul Metro station is a 5-8 minute walk away. Travellers who are elderly or have heavy luggage may encounter difficulty with the Metro steps and lugging suitcases along the streets. We had no issues though.
The studio was clean and well stocked with all the necessities. Having laundry with a dryer meant we didn't need to pack too many clothes. Strong wifi even with four devices logged on. I would definitely recommend her place to friends planning to visit Paris.