If you look through this forum carefully and Google rentalinrome.com you will find mixed reviews. This may be fair enough when it comes to assessing decor, location, amenities in apartments, etc. Different people will have different views.
However, what you should take careful note of is the experience of reviewers who have been ripped off. Unfortunately for me I only discovered that my experience with rentalinrome.com was not untypical, after the event. Had I done a bit of basic research I would not have gone near them.
We booked a 2 bedroom apartment and paid a deposit of 136 Euros. About a week before we were due to make our trip we were emailed by rentalinrome and informed that there had been 'extensive damage' to the apartment that we had booked. We were offered inferior one bedroom apartments nowhere near where we wanted to stay. (Again a bit of Google research will tell you that this is a not uncommon scam.) When I emailed pointing out that we needed two bedrooms as neither my wife and I nor my 83 year old father, who was travelling with us, fancied sleeping on a sofa bed I received the following reply:
Unfortunately my research has proven to be unsuccessful, and I found no apartment available on the requested dates in the Colosseum area so If you are not interested in the options I have sent you the only thing I can do is to refound your money.
I hope to hear from you soon.
F******* G********' (name deleted to comply with Tripadvisor regs.)
Despite numerous emails and telephone calls the deposit was never refunded. This cynical outfit even made me go through the farce of filling in an online refund form.
I rather naively gave rentalinrome one last chance to do the decent thing and give me my money back before I posted this. However they have long since stopped replying to my emails.
The moral is this: rentalinrome may have 99 satisfied customers, but if just one customer has had money effectivey stolen from them what should you make of such an outfit? Should you take a chance and trust them? There are plenty of rental agencies in Rome. Do your research and go with one which has no history ripping its clients money off.