My husband and I spent 2 nights at the Locanda before we joined a group tour. We booked the Locanda on Venere.com.
We were very impressed with this hotel. It was extremely clean, and had a beautiful, large travertine bathroom stocked with amenitites for our use. The bed was comfortable, the air conditioner worked well, and there was free satellite tv and a mini bar with reasonable prices. We were also provided with slippers.
We were given vouchers for breakfast (or lunch if you prefer) at the Teatro Cafe around the corner. They served some nice pastries, and coffe or juice to us in the morning.
Perhaps the best feature of this hotel was the location. It was very close to the Piazza Navona, and the area was nice to walk around. The reception was extremely pleasant and helpful. Too bad the 4 star hotels we stayed at for the remainder of trip did not live up to the courtesy of the staff at the Locanda.
we arrived at the hotel too early for check in, but we were given a room to store our suitcases, and to freshen up in. We were also given a drink of cold water by the hotel reception before we headed off to explore.
The Locanda was up on the second (in Canada it would be considered 3rd floor), without an elevator, so this may be a concern for some.
Overall we were very happy with our choice of the Locanda Senatorum. You cannot beat it for location and price.

I stayed here for 5 days from 21 August 2007. I booked the townhouse from reviews on this site. My room was up another flight from the reception; 72 steps up and down to the ground floor-not for the faint hearted. The room was nothing like those advertised. It was very small, intended for 2 people, but that would have been impossible. There was no mini bar and no slippers. The two beds in the room were very narrow and end to end. Having said that, it was clean, the bathroom was fine and the air conditioning worked well. Shampoo and soap were provided.
The best thing about the hotel was it's location, between Piazza Navona and the Pantheon, both almost on its doorstep. The Campodoglio an Forum were 10 minutes away, so walking was a pleasure.
As a solo traveller I would stay there again for it's position.

I stayed at the Locanda Senotorum with 2 friends in June. I found all of my hotels based on the reviews on tripadvisor - it really helps when people post candid photos of the rooms along with reviews. As we all know the hotels only post the really nice photos! I really liked this hotel - it is small and the only downfall was no elevator. It's on the second floor, but anyone that knows Italy knows that the second floor is actually the third floor. Four flights of stairs with tons of luggage is not fun. However, that aside, here is my review:

If you choose to stay here have the hotel book your airport transfer for you with their service - you will save about 25 euros because taxi drivers will try and rip you off (it's about 45 euros through the hotel). The hotel was WAY more reasonably priced than the other hotels I looked at, and believe me I looked at close to 100 in different parts of town.

We arrived late and they had left a note on the door telling me to pick up my keys at the hotel below. Our room was immaculate and there was definitely enough room for 3. The bathroom was large which was a bonus (although the shower door provided good water leakage). As the reviewer before me noted, the mini bar was a good deal and came in handy. The pay per view movies ARE free and you can get them in English, if you select the option for English before you select the movie. There was a safe and a pleathora of toiletries including toothbrush kits and shampoos. They provided ample towels, slippers, etc. They also offer a free continental breakfast (read - coffee, pastry) at a cafe down the road and around the corner which is a great way to people watch while you wake up.

The hotel is SUPER convenient to everything. Its right off the Piazza Navona and close to major attractions, including the Pantheon, Campo di Fiori, etc.
It's a slight walk to the number 64 bus which takes you to the Vatican and just past the 64 you can catch the red 110 bus which is a good double decker to see the city. The hotel recommends a green bus which I don't think covers the best sites, especially if this is your first time. However, the red bus ticket is only valid from 8am to 8pm so consider that if you are riding.

Oh and for those looking for an amazing restaurant that is not too expensive try Grappolo d'Oro Zampona near the Campo di Fiori.

Just got back from Rome - it's early June. Stayed at the Locanda Senatorum for four nights in their single room.

This will be a strange review. The location was good, the service was excellent, and the room was very nice. Nicely decorated, very clean, with good air conditioning. The bathroom was nicely done, and had some above-average toilettries. Pay--per-view movies were all free, covered by the hotel (but only in Italian). I especially liked the mini bar, because all the items were listed at supermarket prices! That's the first time I've ever used a mini bar...normally they're an overpriced annoyance, but this stuff was so cheap that it was really convenient to have it right there in the room, refreshed every day.

BUT! The room I stayed in - I think it was their only single - was behind the check-in counter. Right off the main lobby, where you'd expect the managers office to be. So, at night, I got to hear every drunk guest stuggle to unlock the hotel's front door, and in the morning I got to hear the staff get in to work and start making phone calls and copies and checking guests out. It was difficult to get to sleep before 2 a.m., and impossible to sleep later than 7 a.m. It was horrible - that should NOT have been a hotel room. Worst sleep I've ever had in any hotel, ever. Will NEVER stay there again, and they should never rent the room to anyone.

They gave me a 10% discount when I checked out, and a free baseball cap - and I didn't even complain, or ask....they just knew it had been horrible.

The other rooms would probably offer a normal sleep experience, and everything else about the hotel is great. But do NOT book the single, ever, for any reason. I wouldn't stay there for free. It was awful.