Thanks GB! Ponte Sisto must be really nice... all booked up :(
If you are not looking for a traditional hotel, I have stayed here.
http://www.locandanavona.com/en/
They have about 5-6 rooms on 1 floor of an old building about 2 blocks from Piazza Navona.
Here is my TA review to better understand............perhaps my experience was an outlier?
Pros & Cons here make this an average stay for me and a buyer beware situation.
Stayed recently 2 nights in late May 2016 (Friday & Saturday). I look for clean, nice shower and air conditioning, coupled with location and sleeping ability. This is 1 floor in an older building (walk up 2 flights of stairs, no elevator), blocks away from Piazza Navona, located above a bustling and noisy square. Once inside the hotel door, you are in a small waiting area with reception desk. Check in is OK, but know that this is not your standard full service hotel. Small staff, friendly and helpful. Our room, I believe #105 had a great view, with 2 Juliet balconies. The balconies opened and let the noise in, but once closed, the noise proof balcony doors silenced all street level noise. The a/c was dynamite, likely the best one I've encountered in Rome. Bathroom was clean and shower was top notch, with fantastic water pressure. Really, no issues with the room. The rub is that the hotel (or maybe just room #105) is located directly below the Capitolina KAV , which appears to be some type of German boarding school or residence for students. On Friday evening around midnight and until 4a we heard constant dragging of wood furniture across the floors. Almost like someone was dragging a desk or chairs constantly. On Saturday, there was some type of raging kegger party, complete with wall thumping music and loudly singing students (almost like being in a soccer stadium). Coupled with the once again wood dragging, we didn't get to sleep until around 4a. The hotel can't control this and when we asked what the story the next morning, we got the typical Italian "I don't know of this situation" look. We paid cash for a small discount. Checkout is 10a. Breakfast not included, but the room is equipped with coffees, teas and minor food items. Instead, walk outside next door to the coffee bar and grab some cheap eats, which are quite inexpensive.
I would say the room was nice and the location great, but being unable to actually sleep in the room was an issue for me. Once again, its not the outside noise, which the room filters wonderfully, rather, it's interior noise from upstairs that the hotel can't control. Maybe this was just a random occurrence, but it makes me a bit buyer beware. In room Wi-Fi came up quickly and I was able to make a connection but, either speed was way off or my device struggled, I had a hard time actually surfing the web.
I wouldn't stay here again and, for me, will likely look to stay at a hotel that can control the interior surroundings (i.e. a hotel that has multiple floors or is stand alone).