This place is really awesome. Close to Piazza di Popolo and Spanish steps. Everything in Rome has to be accessed via walking. You can walk to places easily. Host is a wonderful guy. He will address your issues right away.
4 people can stay easily as long as 1 toilette is enough for all ;-).
I had to work from there and internet is always iffy. So if you are planning on working from there using internet, then that may be a problem. However, host provides you portable wifi that you can walk with anywhere and you have internet handy.
I would highly recommend this place.