Lovely apartment, clean, bright, quiet and had everything we needed for a good stay. We didn't meet Veronica but contact with her was quick and easy; a great host!
We enjoyed being in a non touristic part of Paris... But we found we needed to heed Veronica's advice of getting taxis back at night as the vibe in the area close to the apartment was uncomfortable at times. This didn't cause us any problems but it's good to be aware.
There's a homeless shelter / soup kitchen or similar next to the apartment block so we often had to walk past a queue / bunch of guys hanging around, and saw lots of drug dealing on the corner. None of this really bothered us as it's the same in any city and we weren't confronted by them, the apartment is super secure and behind gates so no concerns there!
Location is super useful for Gare du Nord, and 15 mins walk away is Montmartre. Metro is really close too so overall really well connected.
I'd recommend this apartment, especially if you want to be close to the station, and Veronica's generosity with drinks in the fridge, a stocked bathroom, herbs, spices, jams, spreads etc sets her apart!