Excellent location and apartment is exactly as described! The place is bright and tidy, with a balcony to let in light throughout the loft and provide a view over bustling neighborhood street life. Bed and fold down fouton are both comfy. There are welcoming touches everywhere - lists of suggested restaurants, guidebooks, poncho/umbrella, spices in the kitchen, plenty of toiletries.
Monti was a great base for us - one metro stop from the main train station, packed with restaurants and bars (take your pick - we never had a bad meal), close to many sites on foot or public transit. The Colosseum is just down the street.
Monica was out of town during our stay but her friend was waiting at the door with the key and a bottle of wine when we arrived. Both were extremely prompt and friendly in replying to messages and questions before and during the stay. Grazie, Monica and Maria! We'd be so glad to stay again!