A superb experience, confirms why we love AirBnB so much! Exactly as described: Very central location near the Piazza Navona and easy walking distance to all the major sites. We also booked an airport transfer car through them which was a made for a stress free arrival. Only one floor up stairs. Double glazed windows with shutters kept most street noise at bay, never an issue. Great apartment for our family of 4 with two teenage kids (two bedrooms, double bed in one and two singles in other, there are also two extra pull out beds for a total of 6 if needed). Three bathrooms (Important with teens), washing machine and dishwasher made life easy. The cafe over the road (Romoli Bar) had fantastic coffee and was open every morning early.
Some great nearby restaurants, best traditional Roman trattoria we ate at was at "La Campana"- highly recommended.
Only issues: hot water was sometimes only warm (Never cold, but not quite hot enough) and as noted by others the Internet connection is incredibly slow and unreliable, better to buy a local SIM and use cellular data.
Thanks to Fabio and the team, great communication and a very enjoyable stay. Would book again in a heartbeat.