We stayed in this appartments for 4 days in May. It's good for short staying for 3-4 people: two separate rooms, one room has king-size bed, second room - 2 separated beds.
Great location - it tooks just 5 mins to get St. Peters Sqr and Vatikan or metro station. It takes 10 mins to cross the river and approach the center area of Rome. Coliseo is not close, but u can reach it by metro or by walk (45-50 mins).
I would pay travellers attention that the floor in the apartments are very cold. It's made from tile with no heating system, so don't forget to bring slippers.
Also, there is not dish washing machine and kitchen are very small. But if u eat outside that facilities are not required for u.
In general: design and furtinure are quite simple, but it's clean.
Check-in: nice lady met us, explained about main tourist arractives, gave us a touristic map, made a photo of passports and asked to pay a tourist tax. She organized meeting of us in the airport of Rome and transfer to the apartments (price is fixed, 48 euros).