I enjoyed my stay at Roma2b. It's a great value for the price and level of accommodation, and Marino was very responsive through the booking process. The room is on the small side, but neat, clean, and tidy, and I wasn't there very much so I didn't need a ton of space. I'd definitely stay here again if traveling solo, as it worked perfectly for me, but might be a little snug for two people. The location is fairly central - a 15-minute walk to the Termini station, and 10 minutes to the Trevi Fountain and Spanish Steps. The only places I needed to take the Metro to (aside from the airport) were the Vatican and the Colosseum. The restaurant next door, Downing Street, serves good tartare and Marco, the bartender, is great.