I would highly recommend Marjan's place. My partner and I visited in mid January and it was a great location to explore Prague. We walked everywhere with ease but it is really close to the metro network if you prefer. The place itself had everything we needed for a really comfortable stay. The decor is lovely and was cosy inside despite it being pretty cold outside. Marjan was a great host with excellent communications before the trip and gave us a friendly welcome at the apartment with great local recommendations.