It's not good. It's very poor.
Ignore what the Netgear utility says, it's not a true measurement.
That shows that you aren't even getting 100Mbps speeds, let alone anywhere near gigabit (1000Mbps).
This is what powerlines are like I'm afraid, even on a new build the most I've seen in person is around 150Mbps. You will never get anywhere near gigabit speeds with powerline. They are a poor design which is always destined to fail.
A network cable is 8x direct channels of copper directly going to each device, powerlines can never compete with this.
For streaming games or high bitrate HD media, you want a solid gigabit connection between devices. Cat5e network cables are the way to do this.
If I do that Lan Speed Test thing, I get 850Mbps - 950Mbps. This can be achieved using a cheap (£20) gigabit switch or gigabit router, with cables running to each device.
Ask your electrician for routing advice/help.