The apartment is excellent - it is very clean, very convenient, it contains everything you may need (hair-dryer, different cooking equipment, map of the city, shower/toothpaste if you forgot yours - absolutely everything!!!). What's more - the apartment is very stylish and fashionable, it is a pleasure to be there and make a lot of photos - it is a paradise for Instagram fans))
Besides, i was satisfied with the location of the apartment - we didn't use any public transport at all - Colosseum, Vatican, different museums, absolutely all touristic places were in less than 30 mins of walking, so we saved a lot of money on transportation)
Then, the apartment is located in area with plenty of cafes with delicious food and reasonable prices (!) and supermarkets.
The building where the apartment is located is very stylish, the area nearby the apartment is very safe, we came back at the flat several times in night and there was nothing dangerous at streets for tourists.
The host is very friendly and helpful, check-in\check-out were very quick, the host advised us where there are best places to eat, best routs to touristic places.
As for areas for opportunities, there is only one small - it was a bit difficult to tune the comfortable water temperature (not too cold and not too hot) at the bathroom but this is minor thing.
Thank you very much to the host for such nice apartment!