The apartment is located literally 2 blocks from Termini and is about a 5 minute walk, so it really could not be situated any better for most visitors. Buses from both airports arrive and depart from outside Termini too, which makes this place amazingly convenient.
The house cleaner met us at the apartment when we arrived (at 1300) which enabled us to drop our bags off and get straight out into the city. The apartment itself is large and bright with plenty of space both inside and out. There are two terraces; one directly outside the kitchen area and a second roof terrace atop the apartment. This second terrace offers spectacular views of the city and is well worth seeing but we mainly enjoyed the main terrace outside the kitchen/dining room. These views are special enough as you can see right up and down the street as well as the hills on the horizon.
The kitchen is well stocked with a very large fridge freezer, washing machine and oven/hob. The freezer also has ice trays in it, so you can make plenty of ice for your evening drinks! There are plenty of coffee-makers too, so you can enjoy an authentic, Italian espresso for breakfast. The shower room is small but adequate and there is also a room off the shower room which is quite large, where you can store/hang clothes and keep your bags out of the way of the main apartment.
In terms of location in relation to the main sights and attractions, you will need to use public transport in order to reach most places but most can be reached after a short (15-20 mins) journey. Walking is an option but the roads can be quite hectic and short distances can take some time in rush hour traffic.
For public transport, there is a bus stop one block from the front door and two Metro stations within 5 minutes walk, the main one being Termini where A and B lines run. Getting an ATAC card for 24 or 48 hours travel on bus, tram and Metro is recommended, especially given how cheap they are - just don't forget to validate your ticket on your 1st journey!
There is a small COOP supermarket about 3 blocks away at the far end of Termini which is well stocked and inexpensive. However, if you can, I would recommend using the bakery and other food stores that are located in Termini's Mercato Centrale which is mind-blowingly good. The breads and pastries are to die for and they also offer a great selection of other foods and drinks. Well worth a visit or two whilst you're there for breakfast, lunch or supper.
We had a fabulous time and loved everything about this brilliant apartment. When we return to Rome, we will definitely use this apartment again. Many thanks!