The apartment was generally nice, but we did have some issues. The bathroom is accessible from the communal area and the second bedroom (and has a washing machine in it), but the door to it from the bedroom is not a door - it is a plastic screen (a broken one) that offers little to no privacy. This wasn't a major issue for us as there were only 2 of us and we slept in the main bedroom, but with a larger party this could be a real problem, particularly at night.
The main bedroom also overlooks the street, which is not particularly busy but does have a lot of noise the whole time, and with very thin windows the noise at night was very, very loud and difficult to deal with. Sleeping in the second bedroom (which is much quieter) was not an option due to the previously mentioned issue with the door to the bathroom offering no privacy.
The jacuzzi bath in the second bedroom does not work at all, the water trickles from the tap and the bubbles don't work.
We also found the location less suitable than anticipated. The Colosseum is right around the corner, but the actual area itself is only OK, and it takes around 15-20 minutes to walk anywhere of interest. After a day wandering around and seeing the sights of Rome we more often than not got a taxi back to apartment, and did the same when heading out in the evening.
We also found that the Rome 'city tax' mentioned in the listing was not particularly clear - it mentions €3.50, but it is actually €3.50 per person per night, so ended up costing us €28 in cash.
The rest of the apartment is really perfectly nice and very clean, and perhaps the bathroom issue is particular to us. The kitchen is well stocked with a large fridge freezer. It is spacious, and Filippo was very quick to respond when required. He also arranged for a later check out for us due to a later flight, which we greatly appreciated. It really is a very nice apartment but we did honestly find it rather difficult for us. Perhaps it may be more suitable for others, so apologies for the seemingly negative review, but we felt that others should be aware of what we experienced.