The apartment itself was brilliantly appointed - had everything you would need whilst also being quirky! It was in a pristine state when we arrived.
The ladder to the bed isn't for the clumsy...
Marco leaves some really useful information and guides in the apartment which proved invaluable for us.
Location was fantastic - 5 minute walk to the nearest metro which was only 5 stops from Termini (the main train station) and only around 20 minutes from the stop for the Vatican. You can easily walk to the Colloseum in around 20-25 minutes.
The area itself feels very safe, we were more than happy walking around and quickly got our barings.
Marco was an attentive host; we didn't need any assistance during our time but I would have been more than happy to contact him if we had needed.