I had a great stay at Marcos Place. He and his Girlfriend Silvia are awesome and very helpful hosts. The Apartment is really nice and located in a calm quarter almost at the periphery of Rome, but since the Metrostation Alessandrino is less then 5 minutes away, you have a good connection to the center. There are three supermarkets and other shops nearby, so you'll find anything you need. Directly in front of the house is a bar, where you can get a great cornetto in the morning.
The Room is bright and cosy and also very good for a longer stay. The bed is comfortable and also big enough for taller people. There's also lots of storage space for your stuff. The Bathroom, which is for the guest only, is modern and recently renovated. The Kitchen is fully equipped, so you can also cook during your stay. I really recommend Marcos place and would come back any time.