So the objective is something that is smaller and lighter so you can more easily take it up and down a flight of stairs, preferably in one trip.
Here are some suggestions.* Note I am from the USA so the link are to USA sources.** You would need to look for local sources.
Can you store a table or box of some kind on the ground floor? Maybe a picnic table or something else you can use? Perhaps something you can keep in your car.
AWB 'ONESKY' REFLECTOR TELESCOPE – Tabletop - 130 mm - 14 pounds
Reviewed in Dec 2015 Sky and Telescope – gets many good reviews. Collapsing design makes it very compact for storage and for transport. Includes finder scope and 2 eyepieces
Frequent out of stock situations so plan your purchase.
http://store.astronomerswithoutborde...mqj5tia3qer8s7
Video
https://www.youtube.com/watch?v=-muZ9KRMY40
Celestron Omni XLT 102mm AltAz refractor - all up around 14 pounds
https://www.amazon.com/Celestron-221...ctor+telescope
Video
https://www.youtube.com/watch?v=2oiPcZy2SQc
How about a 6" Dob? - Can you carry 35 pounds as a unit?
Orion XT6 Classic Dobsonian Telescope Starter kit including barlow, moon map, observers guide, planisphere, red flashlight, 25 mm eyepiece - about 35 pounds but can be moved in 2 pieces.
6”/150 mm
http://www.telescope.com/Telescopes/...CategoryId=398
Video
https://www.youtube.com/watch?v=zonuiO7h4gs
Interested in GoTo?
Orion Starseeker IV 150 GoTo – 22 pounds
Computer assisted and motorized, will find the targets and then track them.
http://www.telescope.com/Orion-StarS...tarseeker%20IV
Video
https://www.youtube.com/watch?v=Z7goOnANFZQ
How to align and use
https://www.youtube.com/watch?v=s0a4HKmEDGo