Karina was a great host. She put us in touch with a concierge who helped us with our check-in and offered advice on how to get to the flat from the airport. (If you have luggage, the best option is to take an Uber.) Karina also put us in touch with Bnblord who provided us links about the must-do things in and around Paris.
The flat is in a prime location and there is no beating that fact. It is a 4-5 min walk from the metro station and Champs-Elysées is actually bang opposite that 4 min away (2-3 mins if you walk fast) metro station. The flat is on the 2nd floor, however, there is a lift that opens right in front of the flat and hence makes life easy. That flat was a little smaller than our anticipation, but that can be overlooked considering its location. The kitchen, although compact, had all the required amenities, including the dishwasher (which is a life saver if you plan to stay a while and cook).
Overall, our stay was comfortable and we would recommend staying at the flat. The place is lovely.
Just a word of caution - We all got bruises from banging our arms into the door handles (bathroom, toilet and main door) in the hallway as it was quite narrow. I am a small-sized person and I also needed to be extra careful.