Very convenient location, close to Euston and St.Pancras stations as well as King's Cross bus stop. Great location to explore central London like British Museum and Library, Madam Tussauds, Oxford street. The apartment itself is also very comfortable. The only problem was to find the place on the first day as the taxi driver from Gatwick didn't know the area well. Graphical route map could be handy for those who use taxi services (like entrance to 51 Argyle street is through Crestfield street on Euston road, not from Birkenhead, Belgrove or Argyle streets).
Overall, the experience was very pleasant. Thank you Brigitte.