I had an amazing 17 days in Hélène's apartment and I thoroughly enjoyed it!!!
The property is very close to three metro stations, supermarkets, a chemist, restaurants and cafès etc. There was a market very close by at least once a week, and many lovely places that you could just wander to.
I felt very safe and didn't have any issues at all, other than there being quite a lot of traffic and street noise as it is just off a main road, however the chemist sells earplugs so that fixed that problem.
I would highly recommend this apartment if you are a single person, or a couple, and you want the true Parisian experience and I would gladly stay there again!!!