Staying in Markito's apartment has been one of the best Airbnb-experiences I've had. The apartment was spotless and featured everything I needed (and more). The bathroom was spacious and clean, and the bed was very comfortable.
Even though the DLR runs right outside the apartment building, I had no problem with sleep throughout my stay. (The windows are well insulated, and the bed is placed well in the apartment, with the sound from the DLR in mind)
The apartment building felt safe, with a concierge, calling system and electronic key dongles.
Even though I had forgotten to tell Markito about when I wanted to check in, I felt taken good care of. The concierge let me into the building and helped me connect to a wifi, so that I could text Markito. He responded almost instantly, even though he was at work, to give me all the information I needed to get into the apartment.
The apartment is only a 10-minute suitcase-stroll away from the Underground stops "Aldgate East" and "Tower Hill", connecting the apartment to the Circle-, Hammersmith and City-, and District- lines. That's basically all the lines you need to get around in London.
I would definitely stay at Markito's again.