You will not find a better located rental - right on the Royal Mile steps from St. Giles, 10 minute walk to Waverly Train station, centered between Edinburgh castle and Hollyrood castle. The living room/dining room (combined) provides seating for sharing space and a meal and the kitchen is well stocked for a short stay.
Positive: location, dining table, living room sofa and chairs, queen beds and dressers in each bedroom.
Negatives: no provided WiFi also means no television (to watch local news/weather); the building shared areas like stairwell, entry and rubbish were not maintained and probably out of the host's control - overlook this!
Notes: The steps are daunting - I think I counted 40 - steep and winding so hauling luggage is a challenge. Buy extra toilet paper, the provided roll was not enough for 4 adults for 4 days. Bring a washcloth - similar to most European places they do not provide them. If you are from the states, consider bringing a sleep sack or top sheet - just like most EU places there is no top sheet.