We stayed here as a family for 3 nights. The location is very quiet and away from the centre. On the bus it's probably about 25 minutes to the centre. There is a bus service but I'd recommend a car for staying here. There's parking all around the building but it's not reserved. We never had problem getting a space arriving quite late at night every day. There's an Asda a couple of minutes drive away and a few chain restaurants nearby.
The apartment was well cleaned and as described with good internet. The beds are on the soft side but comfy. The apartment is on the 7th floor but there is lift access. There's a washer/dryer for cleaning if required. The only thing we'd note is that Edinburgh is extremely light in summer (it gets light around 3am and doesn't get dark until 11pm). The blinds on this apartment are very thin so if light disturbs you make sure to bring a blackout blind.
Overall a great apartment for the price. The living room has lovely views out to sea and you can see planes coming in as they circle around Edinburgh (no noise from them - just something nice to view). We'd happily stay here again and can recommend it.
Check-in was self-check-in via a lockbox with very clear instructions.