We had such a great time staying at Cem’s place for five days. The apartment was in a fantastic location - with three different metro stations within a 10 minute walk! You are also spoiled for choice in terms of patisseries and shops, so it you want to buy your own food that is also an option! The balcony was the best part of the apartment in my opinion - we sat out in the sun more than once with a party and a coffee, soaking in Paris!
The flat is very small as others have noted - but perfectly fine for two people during a short stay. The only downside is that the kitchen is very tiny, so only one person can fit in at a time, and it was sometimes difficult to get out plates and arrange food due to the lack of space. The shower is also very small, and a few things around the place seems quite flimsy/old, for example the kitchen tap moves around when you try to turn in on and off, and the bathroom sink unit seemed quite warped and water damaged at the bottom. These things did not really effect our stay, however, and I wouldn’t consider them problematic.
Overall it is well worth staying at Cem’s place for a trip to Paris - the location alone makes it a great choice!