Josef's place is really nice. Lots of space, modern furniture, very warm, two en-suite bedrooms. Whilst it's not in the centre of Prague Old Town, it actually benefits from being closer to local amenities at more reasonable and often better prices. It's also a great location to walk around other areas of Prague you may not think to visit. If there were any negatives, I'd say be mindful there's a team stop right outside the apartment and they do run into the early hours - earplugs may benefit light sleepers.