Had a reservation made in January for a May stay. When we got there they first lied that there was "water problems" with our rooms. They finally admitted to overbooking. Sent us to a lower class "dorm" style place out side of of the downtown area and then tried to charge us the same price! Had a "intense" conversation with them when it came to checkout on the bill. Be very careful if you book a room here.

Positives: Location, Price and Cleanliness
Negatives:
Our reservation was made in January through Venere.com, so of course we had a confirmation number. Upon arrival we were told only one room was available because the "water was out." He finally admited they overbooked, because he was being caught in multiple lies. My parents stayed at the hotel, while the four of us were shuttled to a hostel 5 minutes away, outside of the city and no where near a Metro. The hostel had no A/C, TV and a shower head ABOVE a toilet and sink! Only by persistance did we make sure the hotel paid for our taxi shuttle to and from the hostel to meet my parents at the Bundi. The next day we arrived back at the hotel to be told only one room was available and the other couple had to stay across the hall at Rosetta!
To add to this wonderful experience... upon checkout the gentleman (who apparently overbooked the hotel) told us the first night would be taken care of. Of course this was not. Instead they wanted to charge us 20 euro more for the two rooms at the hostel! Taxi cab rides were deducted from one room by an employee and owner was trying to say that this was a discount! Unreal. After 20 minutes we were finally able to get them to charge us the original rate for the first night which even that was unacceptable since it was a hostel outside of the city!
No communicaton between staff. Rome is definately a city you need to be careful of when it comes to stores, restaurants, taxi cabs and hotels. Someone is always trying to rip you off.

We booked the hotel through romeby.com. The hotel was slow to confirm that we had a room ( we had left it quite late to book a triple room - not a good idea!) We also asked them to arrange a taxi to meet us as we were arriving about midnight and couldn't be bothered with buses etc. (cost 80euro for return journey from Ciampino) They were waiting for us and turned up on time to take us back.

Hotel itself is very near Colosseum and we walked everywhere (including to Vatican and Trastevere). Our room had a double bed and a single bed - very cosy as probably only 30cm between beds. Seemed to be reasonably clean. We overlooked a very narrow street behind the building but couldn't have window open as too noisy (couldn't hear street noise with window shut). There was air conditioning so not a problem. However I would recommend earplugs to avoid hearing the other residents and people at reception. We could hear people talking, showering etc in the 2 rooms either side of us. The en-suite with shower was fine. There are only 5 rooms and a small reception. It's basically a converted appartment on the 3rd floor (I think) There's no lift but you're only carrying bags up and down once. From the street there is a massive wooden door with a brass plate to the right of it with the hotel name - very easy to miss. We got given vouchers for breakfast to be used at a cafe down the street a short distance and across the road - only a croissant and tea/coffee.

The first thing I must say is that having stayed in Rome twice now I realise you don't get much for your money, which isn't the San Danielle Bundi's fault; if you want better you'll have to pay more. That said I was a little disappointed with some aspects of the B&B. Our room had obviously been thoroughly cleaned in some areas, but walking across the floor barefoot meant that we transferred hairs into the bed which definately weren't ours. In need of a vacuum rather than a sweep maybe? There was also no shower door on one side so the floor got very wet whenever we had a shower. The room wasn't huge but big enough for us and reflected what we paid.

However it was noisy as it is in a building along the Via Cavour a big main road. We couldn't have our windows open at night for this reason, but the location made the hotel dead easy to find at least. It was also very central, especially for the Roman Forum, Colisseum and train station which were all within walking distance. We also walked to Trastavere, the Centro Storico and the shopping district around the Spanish steps without too much trouble, and there is also a metro stop 5 mins from the hotel, all of which was really helpful. I think in Rome for the money we paid you either get location or nicer accomodation, and since we were only there 2 nights I'm glad we were in a central location.

The San Danielle Bundi is an annex of another B&B where the reception is, although it's hard to figure this out. When you arrive ask for your breakfast vouchers and anything else you need as you'll be given a set of keys and pretty much be left to your own devices. Breakfast was in a nice enough cafe across the road, and was a coffee with a pastry and bread and jam. You just present the voucher and they bring it to you.
Other info worth knowing; there's no air-con but a good working fan in the rooms, there's a lift, and you can access the internet but it's the reception computor, so you won't want to look up more than urgent information as the receptionist (who spoke good English) was standing behind me waiting to have her desk back!