Marina and Alex's place was in a fantastic location, about a 10 minute walk from the Old Town so it was perfect for exploring Prague. It was also very clean and tidy.
Unfortunately, it was super loud. We could hear music from our neighbours at 3am and people talkin outside the window at all hours of the night. That's not the host's fault at all, though, but it is something to bear in mind if you book here. We were also only given one roll of toilet paper for the five days we were there.
Otherwise, it's a fine place to stay, especially if you bring sleep headphones or earplugs.