I would recommend Rob and Eli's place. It is in a great location in the old city and near the new city. The guide in the room was very Good and then when we met Rob he gave us more details about where to get good inexpensive beer, fried cheese and Czech food. There is an excellent French restaurant downstairs but you must have a reservation in advance also not very friendly. The rooms are very spacious and very clean. We enjoyed the tv system and movies very much as well. The washing machine wasn't working but they said we could just give it to them and they would take of it...but we didn't opt to do that.
I would definitely stay at the house again and recommend it to others. I also recommend a walking guided tour with Honza / that was a highlight for me as well as the great beer and apple strudel dessert at the Louvre!