On the first night that I was staying here with my wife and 3 kids, we by accident left the set of keys in the room. The room auto-locked behind us. We tried every possible means to contact anyone related to Residence Europa, including hotels.com messages, calling hotels.com, and calling all available numbers at Residence Europa. We also asked others who were staying at the hotel and there was no way to contact anyone related to Residence Europa after 9pm. So me, my wife, and my 3 young kids (all age 8 or younger) had nowhere to stay in Rome! Luckily, after an extensive search, we eventually found another hotel around 11pm that night (that was small and expensive but much better than sleeping on the street). We ended up getting back into our room the following morning by finding the cleaning person.
Residence Europa staff never apologized and never responded to any of my several messages. When we requested a refund for the first night (through Hotels.com, as we never received any response from Residence Europa), Residence Europa declined. Overall, it was the worst experience we have ever had with a hotel.
Given the above, I would adamantly discourage anyone from staying at Residence Europa.