Just skimmed so sorry if repeating. I am a landlord and aim to be a good one. Be flexible and consider reasonable demands.
We rent at market rent but don't put rent up when tenants in situ. Current ones have been there for ages so now getting good deal.
Your mortgage company will insist on either shorthold assured tenancies or a five year (prob) let to housing association. Your mortgage company may prohibit eg housing benefit or students. HB is paid four weekly and not monthly so HB tenants may wish/need to pay on a different cycle from your mortgage. Not a problem if you know about it in advance!
We have a small two bed flat in a nice part of London which we usually let to a young couple or sharers (we lived in it for a long time), so what we provide not nec what you would want for a young family. We have good condition neutral decor. We don't paint at every change-over but do paint when looking scruffy. We once had tenants who wanted to move in before we had painted, when we were planning between lets, so we have them the painting week rent free. But no longer than three years between paints.
Second the point about shelves and hooks. It is better to make sure these are in sensible places and put up properly or people who are crap at diy or don't have a drill will make a botch of it. Same with picture hooks. Put them up properly yourself or you'll have huge cavities in your wall. These things make it much easier for people to make it a home.
We provide ikea furniture. Not the cheapest or the most expensive, but stuff that will stand up to everyday life and looks good. Don't over-furnish - that is annoying to live with but make sure the basics are there if renting out furnished. As to which to do, I'd ask a few local agents about the local market. They will know. Last time we renewed the furniture we bought a fun and funky sofa (well, sofa bed so the can have visitors more easily) which would go down well with our c25 yr old renters. It has done .
Don't provide too much equipment. Most people have lots already. If somebody asks for a kettle and a toaster provide it, but don't go out and buy if before you let. Do provide a decent vacuum cleaner if you want people to look after the house. Do let with spotless carpets. Charge (fairly) for cleaning outrageous stains but not wear and tear. We put down wood "laminate" which we intend to renew every ten years.
We provide dishwasher, washing machine and fridge. We did provide a small freezer but one set of tenants said it took up too much room so we took it out and have never been asked to replace it.
Specify in contract responsibility for garden and provide tools for the job. Not only is this fair it is a requirement.
You are required by law to have a gas safety check every year. If house is only four years old unlikely you need carbon dioxide monitors as boiler should be safe, but check that out.
Make sure tenants know to notify you/agents straight away if there is a problem. Works better for everyone this way.
Don't be tight.
Budget for a maximum rental of 48/52 and build up a reserve of a new boiler, a month's mortgage, and emergency odds and sods.