Irina's apartment is beautiful, in a very upscale London neighborhood. It's about a 10-15 minute walk to the nearest Tube stop, with an option for an Overground station that connects to the Underground (all covered by your Oyster card).
The apartment is well appointed and was much larger than we expected. My wife and I had the bedroom with a double (by US standards) bed, and our 2 children had a separate bedroom with twin bunk beds. We also were able to relax in the large living room. It was so nice to have so much room for everyone in our family.