Not being funny, but I think making a 'pic of the inside of your house', is not wise, for all to see on a forum. Having done a number of telephone/cctv/television cable extentions around property, I found that it is rather simple.Just sit down,look at the possible routing, decide where you want your cable run, then go ahead and do it.If you are not into lifting floorboards etc,then go via skirting boards and carpet runs.
Should you decide to go the 'wireless' way, then a visit to a good computer shop (PCW perhaps) or email to someone like Belkin, should give you the necessary advice,prices etc. If you purchased your 'wireless' equipment from a retailer, and if they stated that it would work, on your property, and it doesn't, then you could claim a refund.Not sure if Argos, do a 16 day returns/refund on this type of unit!(;o).
I agree with spuds, it's not necessary to draw a pic. Work out the shortest route, just as Spuds says. Measure it and add a bit. Then down to your local hardware shop (better still B&Q, Focus, or whatever diy store is around to buy telephone extension cable (usually available by the metre), a pack of clips to fix it to the skirting boards and an extra phone socket. Not expensive, maybe a fiver or so? but exact amount depends on the length of cable.
why dont you just get an extension cable for the telephone socket and not worry about the ugly way it looks when its laid. stick it on the wall with those weird pin thingys. lol im not a diy expert. i have an extension to my room upstairs and it doesnt look half bad if it is done neatly. :/
just a thought, do you have any central heating pipes going up from livingroom to room above, if yes there is a possibility of passing a length of solid wire through hole tape on one end of extention wire and pull through, having purchased the measured length of phone cable and one socket from maplin or any diy shop and follow the wire colours on main socket exactly to the extention socket using nos 2,5,&3.worth a try.