Costanza's place is great value and perfectly central to all the major sites in Rome as well as being a short walk to less touristy neighbourhoods like Monti and Trastevere. The apartment is stylishly furnished with a cute, mod look and the kitchen and bathroom were impeccably clean. Although there is a pull-out bed in the living room I think that Costanza's place is best suited to two people.
My husband and I stayed there for 6 nights and it would have been nice to have available a few extra staples (bath/shower gel, milk/tea etc) but there was a supermarket very close.
I would also note that the TV only has access to Netflix and not regular TV (I don't suppose this is a big deal for most travellers but my husband was keen to watch some of the Soccer World Cup). Another thing to note is the shower. As you will see from the photos it's a hand held shower without a screen/curtain - meaning you get the real Roman Bath experience :-). Water pressure and temperature is perfect.
Costanza is a kind host who gave some great local recommendations and also assisted us with organising a car service to and from the airport!