I stayed at the Grand Hotel Gianicolo in late August for 4 nights with a friend. My overall impression of the hotel was excellent, despite a few teething problems at the beginning of our stay.
We arrived late at night and pretty frazzled due to a long journey to find we had been allocated a double room, despite asking for a twin - not a good start. I must admit, if I had had to stay in the double room for the entire stay I would not have been happy - the room was tiny and had a view of the breakfast room roof !
However we reported this to the concierge at reception and he allocated us a twin straight away. This room was far better, with a jacuzzi bath no less, and a view of the gardens. It was also much more spacious.
Apart from that our stay was fantastic. We found the hotel staff to be extremely friendly and helpful (especially Marco the concierge and Enzo the breakfast waiter). They directed us to bus stops for all the major sites and provided us with a very helpful map to guide us. The hotel is located in a residential area quite a way from the centre, but to be honest we found this to be a bonus. It was quite nice to return to a quiet area after a full days hectic sightseeing ! Plus you have the best view in Rome literally on your doorstep (so good that even tours stop off to see it). The only thing lacking in the area was restaurants, but we found we were staying out in the centre until at least 7pm so we had our evening meals there where there is an abundance of eateries.
There was a bus stop a few metres from the hotel which took you directly into the centre of Rome. We bought a 3 day bus/train/tram pass for 11 euros but found nobody checked the ticket even once ! (not that I'm advocating not buying one !). The busses were frequent and the journey only took about 10-15 minutes. Even the bus drivers were extremely helpful. If you ask, they will let you know when you reach your destination, although it's better if you can learn the phrase in Italian as most don't speak English. We didn't find it a problem to get around at all. The 44 and 75 bus routes are the best for getting to and from the centre. Learning a smattering of Italian is a definite bonus as many people only speak a smattering of English and they definitely seem to appreciate your efforts (no matter how rubbish they are !).
The breakfasts at the hotel were absolutely superb with a fine range of breads, cakes, pastries, fresh fruit and vegetables, yogurt, spreads, cheese, ham and of course fresh cappuccino (which you have to ask for incidentally). We ate so much at breakfast we didn't really need lunch !
The pool is the perfect antidote to the Roman heat and was mostly empty. We booked a taxi to the airport on the last day which, although expensive at 55 euros, was very comfortable and made for a stress free end to the holiday.
I would definitely recommend this hotel and will be staying there again next time I visit Rome. I think it's extremely good value for a city hotel with a pool. The only thing I would say is take some ear plugs - the walls are paper thin and you can hear everything that's going on !