We loved the location of Martine's flat, with lots of restaurants, local shops etc just a few minutes' walk away. There are numerous bus stops and metro stations within 5 minutes walk, and Montparnasse sation is only 10 mins walk away. The area felt very safe.
The flat is in an old building with Parisian character, which we liked. The bed was very comfortable, and the shower powerful. The kitchen was well-equipped (be warned: eating out in Paris is expensive!) although it took a while to work out how to use the hob and oven as we couldn't find any instructions. We were surprised that there was no corkscrew, but that was soon remedied with a trip to the local supermarket!
We'd assumed that the toilet would be in the ensuite bathroom, but it was separate, by the front door. This might have some advantages, or even be preferable for some, but for us it wasn't ideal.
The flat felt like it could do with a bit of a spruce up - some of the fittings were a bit tatty, and the paintwork scuffed. However if you're looking for a comfortable base with excellent transport links in a bustling part of Paris it could be a good option.