Our stay at Walters was Lovely, the house is old with gorgeous wooden doors, the kitchen has anything you would need for a stay in Rome (though I don't know who would cook for themselves while in downtown Rome haha), the shower was fine with a hot waters running all the time, the Living room has some modern touches to it but in a stylish way, it is very wide and feels homey, the 2 Bedrooms come with a double bed, the matters is comfortable and each bed comes with 2 pillows (there are always more blankets if it gets too cold or if you prefer a blanket each).
The rooms are not soundproof between them as the wall was created to not touch the wooden ceiling, it didn't bother us but if you are looking for 2 rooms with privacy between them, maybe this will bother you.
The area is really central, on the quite side of Trastevere, near some really good resturants and a walking distance from almost every part of Rome, the coliseum is 15ish minutes walk for instance.
Walter was responsive, helped with recommendations and has a charming personality.
Would defiantly come back again!
Yarden.