As so many people have stated, the location is fantastic.
You can easily walk to the Colosseum, Trevi Fountain, Pantheon, Piazza Navona etc.

No Metro stops nearby, so buying the Roman Pass just for this, could be a waste of money, but the main public bus stops across the road.

Front desk were very helpful. I even returned to the room to find a nice chilled bottle of bubble on my birthday, which no-one had prompted them for.

Breakfast more than adequate, with good coffee and breads, as well as some hot items. Breakfast room also a nice setting.

Rooms clean and functional, if a little small. But in response to the moaners on here about showers - I'm 6'2" and not exactly slender and I managed fine in the showers. They're not the biggest, but you can cope.

My biggest issue was the strength of the external door lock on the room. On our first room I could open the locked door with a firm tap from the heel of my hand. They sent someone to fix it, but when we returned 6 hours later it was no better. In the end we had to change rooms. My advice is to give your rooms a good check once you've closed the door.

Also - collect your safe key upon check-in, to save you going downstairs for it later.

In summary, location and the room rate (try Hotels.com) sets it apart from some others in it's class or in the area. But what you make up for in location you lose in room space - but it's Rome and you can't see it from your hotel now, can you?!

We spent a couple of days here after a Royal Carribean cruise. Hotel was excellent. Only small quibble might be that the shower is quite small but as neither my wife nor I are very 'large', this was not a problem for us. Very clean, friendly, courteous staff, nice breakfast . Bar and bar staff very welcoming.

Spent three days here with spouse. Very nice location, could see all the sights! The rooms and hotel were kept very clean, breakfast was good - and the staff friendly and spoke english. My only complaint is that the roof terrace/garden was not "open" - you could go up, but it wasn't attended to, and seemed like a wasted opportunity for the hotel since the view was beautiful.
Over all a good hotel, not a bargain, but not over priced.

Very impressed with the Cosmopolita. In a great location in a clean and safe feeling part of the city. I loved breakfast, and feel that it would satisfy most appetites, the best that we have experienced in about 6 European hotels. I do feel that some people are very picky about what they feel a good breakfast is - but to me fresh bread ,eggs (fresh tasting to me), cereal, fresh fruit, pastries, meat, cheese, fruit juice and tea and coffee is all that is needed to set you up for the day. I did see a glimpse of what looked like a v small room, so I would advise to pay a little extra for a superior room as it was a good size and offered a lovely street view of Rome - and the sound proofing was amazing with no street noise at all, air con also worked well. It is true that showers are fairly small and if you are a bit overweight you might struggle, but you should still manage to fit and if you need more than 1 hand towel & bath trowel each I'm sure that the hotel will give you one - but remember to think of the environment and wastage! Most convenient way to reach the hotel was to get the Terrovision bus from Ciampino and if your luggage isn't too heavy and you have a good map then walk to your hotel - it will take @30 mins but it's a nice way to see Rome. Roof top terrace is also a lovely way to end the night with a distant view of The Vatican.