Nelly place is perfect for a stay in Athens. We arrived very late but the accommodation wasn't a problem with smart lock. The apartment is well communicated, is 10 minutes walk from Monastiraki district and only 5minutes walk from metro station. Nelly is a perfect host and she answered very fast. The only minus is lack of shelf in the wardrobe, so we have to use the couch in the living room like wardrobe :D
I fully recommend that place for trip to Athens : )