Our stay at the flat for 5 days was pretty good. Apartment was much smaller than expected from the pictures, but it was still good - clean, newly renovated and modern and considering that we'd leave apartment early in the mornings and come back late, size of it was not an issue for us.
Some minor problems: we were 7 in total and there were not enough bath towels for all of us for 5 days. Another small issue was that upon arriving at the apartment at 3pm, the keys were not available as per the instruction. We were lucky that the building door was opened by one of the residents and we were able to knock on the apt. door. Issue was that cleaning was not finished by the time it was supposed to, but we didn't complain, because we were tired and we managed to go in the apartment.
Last but not least, hot water would sometimes not work in one of the bathrooms and we could not understand why. Anyways, it happened twice and was frustrating but all the other times, it worked just fine. Another issue with the bathroom was that water was leaking out in the bathroom and out in the hallway and we had to use our own towells to dry it out, but all the listed problems were managable in the end:)
Location - Location of the apartment is good, considering the price per night. It's several minutes away from Gare du Nord - railway station of Paris. The neighbourhood is not the most interesting around, but you are 15-20 minutes of walking from the bustling, central districts.
All in all, it was a very good value for money and if you are planning to spend the whole day outside to see and explore Paris with friends, this apartment can work just right for you.