I really recommend this appartment. Absolutely cozy and comfortable, and near to all the popular sites: 20-25 minutes to Colisseum/Fontana de Trevi/Spagna Square, 30 minutes to Vatican... The appartment is placed in a calm place near to many restaurants. And don't forget to visit the cake shop right at the front corner.
About Corinna, very charm and ready to help during your stage in the room and give you very interesting advices about what to visit or where to eat.