My wife and I recently stayed with Genny and Jalal for 2 nights and they treated us so kindly. They gave us excellent advice on where to travel to within the city and Genny sat down with us at length over our plans for Jordan. The breakfasts were good but given the standard of everything else in the house I would have expected more than white toast bread.
The location is quite far out of the centre of Amman but with cheap taxis it only cost 3JD max to get anywhere in the city.
I would have no hesitation in recommending Genny's B&B to anyone visiting this interesting capital city.