We had a great stay at this apartment from March 19 - 26, 2015.
First, the location: It is located on the Islamabad-Murree expressway, about 15-20 minutes out of Islamabad and 10 minutes from Bhara Kahu. We never had time to travel in the other direction to Murree, but it should be a relatively short drive to Murree. The complex is easy to find as it is well signed from the expressway. Note that it is just north of the expressway toll booth, so unless you have a sticker identifying you as a local, there is a 50 Rs. toll every time you go to/from Islamabad.
The apartment: this was a very nice apartment, well-decorated. Pictures are accurate and the term "luxurious" is accurate to describe it as well. It had a dishwasher (not common for Pakistan), microwave and all the modern conveniences. Although the washing machine was not accessible, there is a dhobi (person who washes clothes) available and the complex also has cleaning staff who you can call to clean the apartment if need be. The apartment was clean, large and had nice terraces that would be great for relaxing on after a long day. (When we were there, there was construction going on opposite the apartment complex, but it did not bother us.) There is a nice looking golf course immediately beside the complex, that we did not have time to try out. We had a couple of guests visit us for tea during our stay and they were all impressed by the apartment and the complex. FYI, there is also quite a small tuck shop and canteen in the building, as well as an ATM. (For larger grocery trips we went to a cash 'n carry in Bhara Kahu.)
Safety: there is plenty of security and we felt safe during our stay. The staff/security were also very willing to assist us as required.
Hosts: our hosts were very gracious, accommodating and helpful during our stay. They were very prompt in responding to questions and very helpful in accommodating our requests. In some instances they went above & beyond what would be expected, in order to make sure we had a good trip (e.g. making sure that there was safe water & snacks waiting for my kids on arrival). I have no hesitation in recommending them.
In short, this was an A+ apartment that helped make our stay in the Islamabad area for a week, a very enjoyable one.