I stayed at Sarka's place for one week while I was waiting to move into a long-term apartment in Prague. Everything was fine. The apartment is on the 6th floor with great views towards the lovely Grebovka park. The flat is really cosy, with good heating and everything you need to live. It's also very quiet with no traffic noise at all. Wifi is fast.
There's a large Lidl supermarket 5 minutes walk away and 20 minutes walk in the other direction you can reach Eden Shopping Centre with a Tesco hypermarket.
The apartment's location is only 3 minutes walk away from Grebova park - highly recommended - and you can walk right into the city centre in about 30 minutes and the beautiful Vinohradska with so many cafes and bars in 5-10 mins.
In summary, I thoroughly enjoyed my stay and recommend this place. Sarka the owner is very nice and did me a big favour by letting my check-in early on my arrival day.