Three of us stayed for one night in Ivo's apartment. We were very happy with our stay - the flat was exactly as described. We found it to be very clean and comfortable. Ivo himself was very welcoming, meeting us outside the flat on the day we arrived and letting us drop our bags off early. We struggled to get the TV working (it turned out to be a cable unplugged by the previous occupant which I should've checked first) but Ivo was very helpful and called me to talk though solutions, even offering to have his friend pop round to fix it.
The location of the apartment was great - only a 5 minute walk from Kings Cross yet in a quiet neighbourhood. We all got a good night's sleep! I'd highly recommend Ivo's flat and would definitely return again if and when I'm next visiting London.