This place has the best location you can get to visit Paris. It is in walking distance of almost everything that is a must to see in Paris, Louvre, Invalides, Opera, etc. It also has very good public transport access, you have at least 3 subway stations near by and also access to the RER that will take you to either airport (Orly or Charles de Gaulle).
One of the minus of the location is the noise, but the double glass windows did the trick and you can hardly hear the street noise inside with the windows closed.
Just remember it is Paris and the spaces are not as large we are used to in the US. Think of it as Manhattan, you have to make the most of any inch available. I would recommend it to a group of up to 5 with comfort, more the 5 you would have to use the living room to sleep and it would be a little crowed, but still livable.
The kitchen offers the basic to make breakfast and a quick bite, I would not cook a larger meal here, even because you have a lot of options of good restaurants near by, on all price ranges.
The check-in was very easy with a access code to enter the building a the key to the apartment on a lock box. The host was very nice and came 10 minutes after we check-in to the apartment to show us everything. We left on early morning and just left the keys on the lockbox, perfect for a early flight.