A flat can potentially suit a Maine Coon, but you must first confirm the tenancy or building rules and assess whether you can meet the cat's needs there. Permission to keep a pet is separate from permission to drill walls, fit screens or install an enclosure. Plan around the actual layout: litter access, quiet rest, safe windows and room to move all matter. Large furniture should not block doors or make daily care difficult. Freestanding equipment may be practical where fixtures are restricted, provided it is suitable and installed according to its instructions.
Consider how you will transport the cat through shared areas and who can care for it if you travel. Your working routine and the cat's temperament may be more important than the address being a flat. Be honest about those constraints before adopting or buying. Prepare a layout before buying large items, showing the litter area and clear routes to doors; this makes practical constraints easier to discuss with your landlord.
For product comparisons alongside this advice, see Paw-Villian cardboard scratcher and Mouse Chase play set. The details below explain their sizes and uses.
Further reading: rspca.org.uk; cats.org.uk; pdsa.org.uk; pdsa.org.uk.
Paw-Villian cardboard scratcher
Mouse Chase play set
Koda Pod