First, the apartment. It is very well taken care of and clean. The location could not be better--it is in a beautiful and quiet part of Trastevere, a neighborhood that can be quite rowdy, but here it is completely silent. Be sure to check out the caffe next door and please do yourself a favor and visit the nearby Villa Farnesina featuring frescos by Raphael.
Now the hosts. Martina and Luca are truly exceptional. They went above and beyond to accomodate me and my needs. The apartment is filled with excellent guidebooks, information about Rome in general, and nearby attractions. They will give you an intro to the neighborhood and there is a detailed manual for any and all practical information you will need.
I cannot recommend them strongly enough--really wonderful people and a location that can't be beat. Enjoy!