Stayed here quite a few times in June and July.
This is a BRAND NEW property and seems purpose built.
Really enjoyed this hotel for various reasons.

First of all, the staff are really trying hard. Both reception and the breakfast staff are great. Customer service here is some of the best I've had in Italy. Really rare to find that in Italy. Felt like I was treated (and valued) better here, than I was at the 5 star properties I stayed at in "Via Veneto" such as the Westin Excelsior and the Marriott Flora, or even the Rome Cavalieri Waldorf Astoria. Honestly, the Doubletree staff here just seem to be trying a lot harder (or are trained better) despite not even being a 5 star hotel.

Location wise it's also not bad....it close enough to walk and from to the main train station of Termini with luggage, but far away enough from the station that you don't feel you are in a rough or shady area of town. The embassy of Argentina is just next door to the hotel. The Basilica of Santa Maria Maggiore and the Italian interior ministry (Palazzo del Viminale) are both very close by. Colosseum is a 15 to 20 min walk away. PAM supermarket (open late) a 2 min walk away. Various restaurants in the area to chose from.

The rooms are very modern with fridges and walk-in showers.
Windows CAN be opened for fresh air.
Most rooms (even the inner courtyard ones) get lots of natural sunlight cause of the asymmetrical shape of the hotel.


Only negatives:

-Not much of a view no matter where your room is located. Even the rooftop bar does not really have much of a view.
-Some people may not like the atmosphere in the streets around the main train station Termini. Especially at night it might not feel 100% safe walking around.
-Rooms facing the street can be noisy if you open the window...if this is a concern ask for an inner courtyard facing room....These are very quiet, but also get a lot of sunshine because of the asymmetrical way the hotel was built.