The location of this place is great! 5 mins to Termini station, 20-30 mins on foot to all tourist destinations. Airport buses arrive and depart from this stations, also, if you come for shopping, outlet buses leave from Termini as well.
The apartment itself is nice and cozy, we were a group of 6 and everyone had enough space. Beds were comfy and there were additional towels and blankets available. A welcome pack of spaghetti and pasta sauce were a nice touch :)
We had no Wifi in the apartment for all our stay, but Valentina provided us with password to a nearby hotel's Wifi which helped a bit.
However, if you are travelling in groups, there are some things to consider:
Hot water is only supplied at one place at a time, i.e. if you are washing dishes nobody else can take a shower, and although there are two bathrooms, 2 people cannot take hot showers at the same time, which is quite a waste of time at night and in the mornings.
We stayed here in December and radiators did not work the first night at all even though Valentina sent people to check on them (it was pretty cold). There are quite difficult to control and even after some of them heated up, some never did.
Also, we cooked a lot for 6 people, but some kitchen supplies are not suitable for that. Frying pans were very small and wobbly and pans weren't big enough for 6.
With that said, Valentina was very nice and stayed in tough throughout our stay and even refunded some money for the Wifi issues.