Willy's apartment is a lovely two bedroom apartment perched above the neighborhood (there is an elevator). It was perfect for the hot August nights we stayed in Paris as we were able to open the patio doors to let in the gentle breezes of cool, evening air when we returned after exploring Paris during the day. We travel pretty light (all our suitcases were carry-on) so having access to a washer and dryer were essential. I looked up a youtube video and the owner manuals online to make sure I was running them correctly, so easy in this age of internet (his WiFi works great!). I was easily able to run several of loads of laundry during our stay. There is also a dishwasher.
There are two grocery stores within 5-10 minutes of walking. The metro is 3 blocks away with an amazing boulangerie near the entrance. Below the apartment is a Vietnamese cafe that serves great espresso for half the cost than that sold in the tourist areas of Paris. This neighborhood had a lot of Asian eateries in addition to the typical cafes. For us, this was a plus.
The neighborhood is away from all the tourist areas. We wanted our teenage daughter to practice speaking French and I wanted to stay somewhere that would allow us to relax in the evening away from the crowds. My younger daughter and husband do not speak French (my husband understands some French), but this was not a hindrance to shopping/eating in the neighborhood. Everyone is willing to help you if you really need it (being polite and thankful gets you A LOT of help and patience from the locals).
We tried all modes of transportation and the easiest and least expensive is Uber (10 euro total to Fontaine St. Michel for a family of 4). Our favorite tours were BlueFoxTravel Blue Bike Tours and Bateaux Parisian lunch cruise, our youngest daughter is 12 yo and the bike tour was her favorite.
The next time we visit Paris, we will first check for the availability of Willy's apartment, because it was such a great place to stay.