1 The front doormat is from the London Transport Museum, and the bristly image depicts London's zonal fare system. It was bought in a sale, presumably because nobody thought it worth buying until the price was under a tenner.
2 The stuffed toy on the side table is a Ty Beanie Baby, official name Puffer, introduced at the end of 1997 and retired on 18th September 1998. Once thought eminently collectible, similar puffins are now available on eBay for less than £2.
3 The 20th century cathode ray television set upturned by the front door malfunctioned four years ago, but is too heavy to be manhandled out onto the landing and down the stairs to the street, so here it rests.
Push open the door on your right to see the bathroom.
4 Yes, the lock's broken. The mechanism ought to push back in with the aid of an Allen key, but the only Allen keys in the flat are too big. Fortuitously almost nobody ever visits, so the lock is invariably superfluous.
5 The lime green and orange alarm clock on the toilet cistern was already here when the flat was rented, because who would buy such a thing? The hands still show British Summer Time, because they could be changed but life's too short.
The next door along the hallway leads to the kitchen.
6 Legend has it that the magnetic letters on the fridge were arranged by a visitor who understood what the phrase portrayed actually means. The use of the letters G and I to form a makeshift question mark shows levels of artistic creativity.
7 Eagle-eyed visitors may be able to spot a selection of Earl Grey teabags, two particularly jaunty sideplates from Stoke-on-Trent, a slightly leaky London 2012 water bottle, and five Creme Eggs left over from the early 2016 season.
8 The brown towel hanging over the rail on the oven is meant to be brown, and was purchased in the early 1980s from the Co-Op as part of a package of essential things to take to university (see also 8a - plastic tray, and 8b - pepper grinder)
Ahead is the spare room - a wasteful luxury in 21st century London.
9 Although now faded, the geometric pattern on the waste paper bin matches that of the wallpaper of the current tenant's bedroom when aged nine, and could hardly be more mid-1970s if it tried.
10 Cassettes were once a popular means of playing recorded music. The assembled collection represents a considerable financial outlay, and can still be played on some (but no longer all) of the hi-fidelity decks scattered around the property.
11 It is conceivably possible that the cardboard packaging which once housed the HP Officejet G55 printer will one day again be useful to relocate the 20th century reproductive device to another location, but it would probably be better chucked.
12 This stack of heritage classics speaks for itself.
Follow the illuminated winter lights to the next doorway.
13 The bedroom is off-limits on this tour, but by standing behind the protective barrier it should be possible to see 13a - a complete set of toy Clangers on top of the bookshelf, 13b - clean socks, 13c - that big purple cushion Mum knitted.
The main living room is the heart of this famous abode.
14 According to the landlord the dining table is a Seventies classic, but he doesn't have to use it, and the matching Seventies chairs aren't exactly practical either.
15 Every home has a Mr Men drinks coaster, and this is no exception, here depicting popular character Mr Happy. Coincidentally of a similar vintage to the dining table, it has become slightly lumpy in the middle through overuse.
16 The west wall is dominated by a geographical map of London, because obviously it is.
17 It remains possible to watch video cassettes on the flat screen television, presumably, if it were possible to work out where the cables plug in round the back without pulling any others out and wrecking the current fortuitous set-up.
Step through the double doors and enjoy the view from the balcony.
18 Alas no, you can't really see anything, can you?
19 This Christmas cactus has flowered every year since goodness knows when, except it got waterlogged during the summer when it rained a lot, so this winter looks like it's dead, which is bloody 2016 for you.
Step back inside, taking care to wipe your feet again.
20 Yes, that is the actual laptop on which the popular blog diamond geezer is composed. Tomorrow's post may even be partly written. No peeking.
Exit via the gift shop. Exclusive merchandise available.