First of all...
Location : perfect for visits to The Vatican , the Museum, St. Peter's . Just a 20 mins walk down hill. The walk up hill maybe a bit much for some so take the bus. You can get a pre-paid card for up to a week from the tobacconists or the kiosks around the city. I got it from the main square near St Peter's on the first say after a leisurely walk downhill.
There is a bus that takes you to an exchange near St Peter's but schedules in Italy are erratic. So please plan to leave way ahead of any scheduled events/tours etc.
To head out, the bus stop is across the road on the right and when you're heading back, stop just past the apartment and walk downhill !
Google does help guide with taking busses/metro to famous sights and spots in Rome. Rome is walkable but with good walking shoes!
Path to apartment:
Best to have light luggage because you'll need to get luggage into small lift then walk across a pathway then a flight of steps down to get to the apartment. So best to have light luggage if travelling alone.
Apartment:
It's cosy and cute only natural light is in the bedroom. If you're not used to European styled apartments, this may come as a shock. But if you're planning to be out as much as possible, this works perfectly.
Shower cubicle may be a challenge for the horizontally challenged :) It was a little tough as I am plus sized but worked out ok.
Kitchen - small and gas stove. So if you're not used to it, cooking meals may be a challenge. There is no microwave. There is a small fridge so best to get some stuff that can be eaten fresh and cold although the amazing food in Rome should entice you out instead of eating in.
Washer - bring/buy your own detergent. There was none when I was there so now I've left the big bottle behind. No electric dryer so if you're not used to hanging your cloths out to dry manually, don't plan for laundry day!
Overall, this apartment truly worked for my first trip to The Vatican and Rome. The location worked out perfectly with it being on a bus route.
Also Paulo is a very helpful host so just reach out to him with questions. He also arranged for pick up to and from the airport which made it so convenient!