We stayed at Alex's place for several nights and it was perfect. Located about 10 minutes walk away from Gare de Lyon, the apartment is also minutes away from several metro lines, including Metro Line 1 (Reuilly - Diderot stop).
The apartment is nicely designed with a lot of personal touches and plants. Some things I loved about it:
-WIFI is blazing fast
-There are several tables if you need to work
-Great water pressure in the shower
-Washer/dryer available
-Espresso machine with coffee beans available
-Elevator in the building in case you have heavy luggages
-Plenty of restaurants and supermarkets nearby
I believe it's perfect for 2-3 people. I would definitely consider staying here again next time.
Thanks again, Alex!