You get what you pay for: The good parts were the wonderful terrace & view, the terrific neighborhood boulangerie (bakery), nearby & well-stocked grocery store (Monoprix), the one-block-away Metro stop, the great 2x/week open air market & the security of the building. The apt is located in a working class neighborhood so you get a feel for a more "real" Paris neighborhood which we really enjoyed.
The bad part was that the apartment was grungy when we arrived and is somewhat rundown. The linens were clean as was the living room tile floor & it was tidy -- the rest was pretty much sticky-dirty & we spent a couple of hours cleaning upon arrival. We also used a spare duvet cover on the couch as it looked pretty rundown. And neither of us are clean freaks.
We are walkers & explorers and this was a great neighborhood to walk -- the nearby canal is less than a block away and was fun to check out. With the Metro so close, it was easy access to central Paris & all the places we tourists want to see in Paris.