I am going to be honest, there are some very positive things about this place! The owner's communication was fantastic, before and during our visit. The location is perfect - right in the middle of the wonderful Trastevere neighborhood and the apartment was as described on Airbnb. It is easy to get around by walking, bus, Metro and train.
But, obviously by my 3 star review, there were things we found disappointing.
There are no windows - which makes for a dark place with no ventilation. It was a warm October (around 80 degrees F each day) and the AC couldn't cool the place well - I can't imagine midsummer. The apartment was very humid and musty - the laundry and bath towels never dried during our stay.
The toilet seat was broken before we arrived, which made for tenuous visits. The bathroom is very small.
The Fire TV did not work for us at all - so there was no TV service. Not a huge deal - but we missed it in the evening.
The mattress was just foam and a bit uncomfortable for us.
We wanted to love it,but have to admit that we wouldn't stay here again.