Simon's place is only a tiny bit away from Edinburgh's city centre, but there are regular buses going to the city and it only takes around 15-20 minutes to get to Waverley. The space is probably only enough for 3 people max at it is just a double bed and a sofa bed, but our group had no issues with the comfort. There are also shops just next door (Sainsbury's and ALDI) so it's super convenient if you'd like to buy groceries.