I stayed at Marketa's place with my partner for about 2.5 weeks. We absolutely loved it. The apartment is perfect for a solo traveller, or a couple. It was sparkling clean and has everything you need for a short or long stay (all the little things were there: soaps, tea, coffee, laundry detergent, cleaning supplies). She left us some Czech chocolates which was a nice touch :).
The area is also great. It is over the river from Old Town. But Prague 7 itself is a great place to explore. Letna park was where we spent a lot of time. And it is very easy to either walk to Old Town (15-20 minutes) or take a tram.
Highly recommended.