Cyril's flat is clean, tastefully decorated, and in an excellent location.
The flat isn't massive, but is more than enough to enjoy your stay in Paris. You're right next to Republique which has lots of young trendy restaurants and wine bars. If you want something a bit more classic, you're only a short metro away from the more central Les Halles. It's easy to get to any of the main spots you'd want to. Centre Pompidou is only a twenty-minute walk, and all other major galleries and museums are less than twenty minutes away by bus or metro.
Overall, we had a lovely time staying in Cyril's flat and we would totally recommend.