This flat is located in a fun neighborhood. Many restaurants and bars around which open early for breakfast and don't close till late in the night. It is a fifteen minute walk to the Louvre and Pont Neuf (which is a nice hangout spot late in the evening). There are a couple of Metro stations nearby (with trains to the airport) which makes it very convenient to travel when living here. However, it is not what you would call a posh/beautiful/nice place. The bedrooms are small and stuffy. There is only one toilet and one bathroom. But I guess Paris being a big city, this was the best we could get for a party of six at this price. As they say, we paid for a "Parisian experience".
About Nicolas, we never met him in person. A friend of his received us. But he was very prompt with his responses. He owns the bar downstairs. Overall it is a good place but definitely low on quality vs cost ratio considering the other Airbnbs we have lived in, in the past.