Marius & Daniela's place is a little gem you should try staying when in Prague and have no desire to stay in a busy area like Old Town but still want to commute here and there with ease.
The place is wonderful, exactly as seen in photos. Very clean and equipped with everything you need to stay a happy life. Not to mention tram stops that are right in front of the apartment and around the corner and the fact that the place is very near to Letna park (if you want to jog with a view) and Bistro8 and Cafe Letka (if you want to eat with style). The place is very safe as well.
I've not met Daniela, only Marius and he's a lovely man. He's very attentive to your request and promptly responding to your requests.
Highly recommend this place.