The apartment is small and very basic, but enough for one person. Everything was clean. Host was friendly and check-in went well. Wifi worked well. Some basic accessories (for instance knife, hangers, kettle) were missing but these could be easily fixed. Washing machine is a big plus. You can't really close the toilet door while you're in there but this doesn't matter if you are travelling alone. Despite the small size of the apartment the entry can fit a bicycle, although carrying it upstairs is not very easy. Neighbourhood is quite noisy, as all central Paris is (mopeds everywhere), so I recommend to take earplugs with you for sleeping. Also you might want to use eye mask during the summer time.
Velib station is just around the corner and metro stations at walking distance.