we two lived in this apartment for 4 nights.
the location is absolutely great! only about 3-minute walk to metro line 9, and not far from the line 5. Taking line 9, you can arrive at most attractions within 30 minutes. This allows you to spend more time on sightseeing, rather than transportation.
nearby the apartment, there are a convenience shop and a bakery, where you can have breakfast quickly. they are helpful to us.
In terms of safety, which I care about most, I think it is okay, because we spent little time walking on the ground. The metro is quite close. there is no strange people inside the building, at least we didn't hear anything noisy or weird when we were spending our time at this apartment in the evening.
the apartment is easy to be found on the street, and the landlord could always responded me in time.
Narrow space above the bed and the easily wetted floor outside the shower room are the only shortcomings my opinion.
Overall, this apartment worths a try for travel.