It is a very nice place. area surrounding is okay. away from rome...always. not as easy to find as reviews say although Google maps will get you there.
find Aushan market. it is close by but we didn't know until last day. make it your first shopping trip.
since you are not in rome I would suggest getting up early to get where ever you want to go. I think the first metro to san giovannia is 6 am. it is worth it to go early to everywhere....vatican...colessum...etc. otherwise go after 10 because rush hour is bad. and come back late. after a day or 2 metro gets easier.
the local area is okay. the eatery near metro is great and they are nice. for all of Rome and pigneto be careful of Yelp. a lot of reviews are either fake or people don't know what good food is.
the flat you are renting is small. 1 bedroom and 1 sitting area 1 bathroom. it is great for 2, tough for more. the kitchen is also small. make ice first thing you do when you get there and keep making it.
it is very quiet so that is nice.