having visited the neighbouring Mycenae - of which this a part - it is a wonderful place to visit. The size of some of the stones that line the approach way to the Tholos (Beehive tomb) are several metres long and have to weigh MANY tons. How they were put in place with such precision is amazing. The inside of the tomb is also extremely well preserved and tells you that you had to be a very important person to warrant such a tomb.
If you are visiting the site at Mycenae I would look at the fortress first and this site second especially in the heat of the day as it is certainly cooler inside the chamber. It is also nearer the parking area for when you have to leave.