It was a very pleasant stay and John was a very nice host. He stayed up late to welcome me( 23:30) and said it was no problem at all. He had nice tips and already had some things in the fridge and espresso for the morning.
The EUR Magliania metro station is very close and you can reach the center of Roma very easy.
It was very clean and I was able to have a good night sleep on the couch-bed.
Would consider to stay there again.