If this place is available for the dates you're looking at, book now without hesitation. It's such a nice little place!
The metro station is a few steps away, as is an amazing restaurant where we had some exceptional pasta the first night we were in Rome. The place is clean, mattresses are very comfortable, and the entire apartment has an aesthetic I cannot fault. The espresso machine is a nice touch, as is the over-sink drying rack, juice, and pastries. It's these little things that add up, making one of the nicest B&B experiences I've had!
Host met us in front of the property, too, talking us through where everything was which was nice. An all round great experience, will definitely book again should I return to Rome.