Pros:
- Good location. If you are going to arrive in Rome by air or train, main train station "Termini" is only 5 minutes away on foot. Day time it is nice around. But in the evening it is completely different. Streets look dangerous because of gang looking guys in every corner.
-Staff is Fantastic. Her name is Jari and she is totally happy to help guests. She gives all the information you may need once you check in. She makes all the best to make your stay better. Any special requests? no problem for her.
-WiFi is good. Good connection speed and good reception.
-Clean room.
-Nice historical building.
-Warm water is functional.
-Breakfast cards. When you arrive, you are given breakfast cards to use in cafe in just 50 mt away. It includes a cup of espresso or americano and a cruvassant.

Cons:
-A/C is disaster. It doesn't work at all. Just noise and no heating. It sounds like storm just outside the window.
-on TV, there is only national channels. If you don't speak Italian, there is nothing to watch.
-My room window was facing to inner area of the building. No view at all. Curtain is just a transparent piece of cloth. No privacy.
-Walls are so thin that you can hear anything from next room.
-There is city tax that you must pay when you arrive in Dandi Domus. It is €2,- per person, per day.
-Linens seemed clean but duvet is piece of junk. So dirty. If you are going there in winter, bring your own sheets to cover duvet.
-There is no "Dandi Domus" sign outside the building. When you arrive there, you must look for building number 39 and door bell with name sign on it.

Overall:
It is cheap. Don't except anything normal standard. You get what you paid. I say, pay some more and get a better and safer looking place to stay.