It was a great stay: the flat is well located (the subway is very close, it’s walking distance to most places in Rome and there are small shops around the corner), well furnished (very convenient for a couple, we missed nothing!) and very clean.
Alonso was an amazing host, from the preparation till our departure - even though we had late arrival, he took the time to welcome us.
The only point is for people used to quiet places: be aware that Rome is a big city with lots of noise, make sure you bring earplugs ;)