The shower is a very tight fit, barely room for 1 person, and the height of about 165cm combined with nowhere to put the sprayer/a single ineffective shower curtain makes for an interesting time. I smacked my head on the large beams more than once.
Just avoid the cards in the bowl, they seem to be the go-to for every other tourist in Rome. They will be very busy, and expensive.
Take the 30m walk to Testaccio, or ride the train out of the city center, for more 'local friendly' places and prices.
Do Not, I repeat, DO NOT take a taxi here unless you want to throw €50 at someone so you don't need to figure out the metro. Ostensia > Piramide > Colosse.
The location is fantastic - right next to the Colloseum, much easier to walk everywhere than you'd think, and also right next to the metro.
I'm sure I'm forgetting something, but hopefully this is helpful.