The apartment is great!
Spacious, well-furnished, great location, close to many subway stations and important avenues!
It's on the sixth floor, but the lift takes you only until the fifth floor, so you'll have to go up a flight of stairs, because it's an attic apartment. It's not too much, but if you have problems carrying your luggage, be prepared.
Regarding our stay: we are 4 adults, it was clear from the beginning, but:
1) the sofabed isn't even close to appropriate for 2 adults, it's REALLY small;
2) the host left only 2 bath towels and no sheets for the sofabed. I got in contact, he apologised, told me it was impossible for him to take the missing towels/sheets at that moment, but promised next morning 10am we'd have everything. Didn't appear, gave no explanation, nothing.