Matthias was a great host, he was easy to get a hold of and made sure to check in to ensure everything was good. His flat was perfect,quite small but well laid out so that it had everything we needed. It is on the 6th floor with no elevator so not ideal if you have mobility issues, however, my sister and I didn't mind!
The location is fantastic, 20 minute walk to Notre Dame and Bastille, a little over an hour to walk to the Eiffel Tower. We walked most places but multiple metro stops are also very close by (5 minute walk).
It's located on a very cool street with lots of shops, restaurant, art galleries etc. There is a small grocery store a few steps away, pharmacy around the corner, multiple wine stores (check out the restaurant next door as well for take home wine) and banks all within a 5 minute walk. Some places to check out: La Ballon Rouge {directly next store, amazing food and wine and even better service} Divin' Art {4, Rue Borda. The best savoury crepes, 5 min walk!} Les Minines (36 Rue de Turenne, worth the 20 min walk! Amazing French and Italian cuisine) and even then pizza shop on the street had great thin crust if you want a late night snack (La Voute).
We would stay at Matthias place again in a heartbeat if back in Paris!