Our family of 5 (two parents, 3 kids ages 10, 9, and 6) stayed 5 nights in Gianmarco's apartment in April 2018. The apartment was small, but bright and very clean, and spacious enough for our short stay. The older kids slept on the pull out couch and the younger one slept on a cot Gianmarco provided and all was well. More than enough kitchen supplies, the water was always hot with good pressure, and the bar right downstairs was super convenient. We especially appreciated the binder with transportation routes to the big sights and where to locate restaurants and a supermarket. Gianmarco gave us excellent directions to the apartment, met us as we walked over from the train station, took us inside, showed us how everything worked, explained tram lines and buses, and left us a basket of treats for breakfast. SO hospitable and no problems whatsoever.
Note - the washing machine (a high point for me as we'd been traveling 2 weeks by this point) both washes AND dries, but it takes 3 hours total and it doesn't automatically start the dry cycle. We put a small load in before we left in the morning and started the dry cycle when we came home for an afternoon rest.
One note that has NOTHING to do with Gianmarco's apartment - even though it is a very short walk to the Roma Trastevere train station (NOT the metro) and several key bus lines, it did take 20-40 minutes, depending, to get to the center of Rome and other sights. Sometimes this worked out perfectly with the kids, other times waiting for Mom and Dad to stare at Google Maps and argue over the route, then walking to the tram/bus, the wait for the tram/bus, the standing on the tram/bus, plus the walking to wherever, plus the same on the way back created some surly faces and not wanting to go back out again for dinner or seeing the Trevi fountain at night. I mean, we made them go anyway (hello, we are in Rome, we are going to see ALL THE THINGS, also gelato fixes most attitude problems), but next time I'd stay a bit closer in. TOTALLY fine for grown ups or more pleasant children than mine. Also the bar at the train station? I probably could have spent an entire week sitting there sampling all the cookies and pastries and been perfectly happy.
Should I have the pleasure of visiting Rome again with just my husband (or my middle child who is a dream traveler and never once whined about her feet hurting or the heat (it was APRIL, it was BARELY 70 DEGREES), I would be delighted to stay at Gianmarco's again.