We stayed at the Prime Hotel Roma Cassia in October and with a little planning this is an excellent, very reasonably priced hotel. The staff were all helpful and friendly and the room was good sized with a king size bed.
A couple of points which may be helpful regarding transport to and from hotel (as it is a little way out of the city centre are listed below).
We bought a Roma pass for our visit (these can be purchased from major attractions (eg. Colloseum) and cost 20 euros). These offer excellent value for money as comprise of a travel pass which can be used on trains, metro and buses for unlimited journeys for 3 days; plus free entry into 2 attractions (including the colloseum) and reduced price entry into many more.
The easiest way of travelling to/from the hotel from the city centre we found was the metro/train option taking the metro (Line A) from the termini to Valle Aurelia (approx 8 stops) and then the FR3 (Viterbo) line to La Guistinia station (approx 8 stops). From there the 201 or the 223 bus (the bus leaves from the main road on the same side as the train station not from the station car park) will take you to the bus stop near the lane to the hotel (the bus journey takes approximately 5-10 mins). We found people on the bus more than helpful when we asked which stop we should alight at for the hotel. Trains and buses both ran frequently. It should also be remembered the hotel runs a free shuttle bus service to and from La Guistinia train station which is pre-bookable and cuts out the bus journey, but does only operate during certain hours.
We did on one occasion use the bus only (the 217 to Paizello bus stop and then change onto 201 to Cassia Via Barbarano) but the train option was much easier as bus stops are not clearly marked.
I would definitely recommend the hotel to those able to make use of public transport etc and wanting to see the eternal city on a tight budget. It is a very nice hotel, if a little far out for some, but the very reasonable price of the hotel reflects that. It may possibly be to far out for older travellers or those unwilling to use public transport as taxis etc can be pricey (as some of our fellow hotel guests had found to their cost).
I hope this information is useful and enjoy your visit to Rome, we certainly did and can't wait to return.