We stayed in this apartment for almost a month. The location was fantastic! It is central to everything that is Paris. Easy metro access, easy walking distance to all major attractions, markets, and eateries. It is on the third floor with an elevator, which is always a bonus considering all the walking you will be doing. We were just two adults, but it would be tight/inconvenient for more than two, especially if the sofa in the living room needs to be used as a bed, which can be quite uncomfortable.
The communication with Diane was super, the check-in and check-outs were comprehensive using checklists, perhaps because this was a long-term stay rental.
There was late night noise from the bars and clubs on streets below, which is expected, and it did not bother us. However, if you are a light sleeper or have the windows open, this can be an issue.
We recommend Diane's place and we would gladly stay here again on our next trip to Paris.