The room is not bad overall. Cleaning could be improved (it's a bit dusty and the extra pillow and duvet in the wardrobe are not sealed in a bag to prevent them from getting dust, which is not hygienic), but the room is quite clean, and so is the bathroom.
The location is just perfect, just a couple of minutes away from Termini and a 15 min walk to the Colosseum and other central areas. It gets noisy because of traffic in the morning, when services start running (at around 6), but the night is pretty silent and this allows you to sleep.
THere's air conditioning and also a fan, so it's not hot even in the summer.
If you're staying a couple of days, it's a good option. Arianna was very welcoming and friendly!