Mortonhall CS is situated in the south east corner of Edinburgh, just inside of the bypass. You leave the A720 bypass at the Lothianburn junction, turn towards Edinburgh, turn right after about 500 yards at the traffic lights at the top of the hill, and follow the signs. It is inside the Mortonhall Estate which is a large country area open to the public and has lots of bridle paths and walks for all animals (both 4 and 2 legged variety). It is very peaceful and hard to believe you are inside a city. It has a number of hardstanding pitches, 3 shower/toilet blocks and a shop on site. There is also an excellent bar/restaurant (Tables Bar) next door (excellent Caledonian 80 shilling ale). Just over the hill is a 9 hole municipal golf course, open to all. At the entrance is the Klondyke garden centre. Rosslyn Chapel is also on this side of town about 5 miles to the south. At Straiton on the south side of the bypass is a shopping area with a Sainsbury's and IKEA. Turn left leaving the site to the traffic lights junction, turn right towards the bypass and keep straight on and follow the signs. The same route leads to Rosslyn. A mile to the east along Frogston Road is the Gracemount Municipal Leisure Centre with swimming pool etc. Pretty good for kids on a wet day. Also in that area is the Hillend Country Park with a dry ski slope. And the Steadings Inn, excellent food.
As mentioned part of the site is sloped but nothing too excessive. However, in high season it can be full of tenters especially during August, but they are usually pitched at the back end of the site and have their own toilet shower block to ease the load. You mention the 28th onwards which is still just at the end of the Festival so will be very busy so I suggest you book now. As mentioned there is a bus stop at the estate entrance, although it is a good walk (500 yards) for those of an unfit nature. Look out for the Highland cattle in the field though. The buses run every 20 minutes (10/30/50 minutes of the hour) during the day (the stop heading to town is on the far side of the road from the campsite and about 100 yards to the left as you leave the site. The bus travels through Morningside into Princes Street where there are 3 stops. It will take 30 minutes. The service number is 11, but beware on return as alternate buses split at Fairmilehead crossroads. The destination should read 'Hyvots Bank', not Fairmilehead, or you will have a long walk. The correct bus usually has a notice board in the front cab area with Mortonhall Campsite on it. The 11 bus terminates at Ocean Terminal if visiting Britannia is on your 'to do' list. The single fare to town is