Even though I didn't met Alex the check-in and check-out was very easy; He gave the keys to the concierge - btw he was so nice! - so it was all very easy!
Alex was very flexible on check-in/out; always answer in few minutes.
The apartment is just like the pictures - very spacious, with a great view and with all the things you need for your stay. It's located in a very calm and safe place.
The DLR station is very close - 5/10 min. walking distance. If you want to go to the centre is like 20 min. There are two supermarkets very close too (15min. walking).
I totally recommend this apartment for your stay in London.
Thank you for everything!