It's a very nice apartment in an ideal location. However, I felt disrespected from the host and didn't like Monica's communication style throughout the experience.
There were times, for example at check in, that she was overly engaged and even nosy. She asked us to text her when we left the airport- which is totally understandable-, but she reminded us to do this four times (once before the trip, then the day before, and then twice the day of our arrival). I texted her as she asked and yet she still arrived 5 minutes after us.
She offered to pick us up from the airport for 60euros and also reminded us to pay the city tax in cash before check in. Again, not a big deal, but mentioning money so quickly (and so frequently!) seemed kinda tacky.
At check out, I told her my brother was feeling unwell, and I asked for a late check out. She asked me what was wrong with him....(inappropriate!). I explained he had hemorrhoids and couldn't walk; we agreed to a late check out, but then I had misunderstood the time and thought we could stay until 2 and not 1 without any hassles.
In my opinion, the misunderstanding itself wasn't the biggest communication issue. (It could have been resolved easily, and it was resolved in the end). However, the biggest issue I have with Monica is that when we had the misunderstanding, I tried to stay polite and clarify the situation by calling her. I rang her twice but she rejected my calls. Instead, she proceeded to text me harshly about the situation.
By not answering my calls, she went from a bad communicator to an immature communicator, and I lost a lot of respect for her. For this reason, I wouldn't stay with her again.
This was just my experience, and I don't think it will be the same for everybody. I think if everything goes according to plan, Monica's apartment is a lovely place to stay while in Rome. But travels do not always go according to plan, and I did not feel like Monica was understanding or flexible with a deterrence from plans. People traveling in a large group where plans can change may want to consider other options.