We really enjoyed our stay at Marco's place. Pros: incredible location right in heart of Trastevere. Walk to many amazing restaurants and lively piazzas right in the neighborhood and also easy walking to all the sites of Rome - campo di fiori, colosseum, piazza navonna, st peters, etc. we never used a car or taxi or anything other than our feet.
Marco met us on time, was very friendly, we had good wifi access, no problems. Little patio is nice (but no view).
Could be improved - it's a little moldy (but Rome is old), bed was not comfortable.
Cons - apartment is a bit dark and could use some updating.
Overall we were happy with our stay because location and acess to the joys of Roma was our first priority!