I hate to add to your woes, but you may need to recalculate your agency fees. I think that they are too low. When I was looking into renting out a house I owned last year, I called a firm of estate agents who also do lettings and property management. I was quoted a one time finders fee of 600 euros PER LETTING to find the tenants. This fee included marketing my property, taking professional photos of it, putting ads and photos of it on dafe.ie and myhome.ie, doing back ground and credit checks of prospective tenants, showing the property to prospective tenants, doing up the lease, taking a detailed inventory of house contents, and taking care of the signing of the lease. That fee was payable every time a tenant moved out, and they had to look for a new tenant to move into my place. ( There was no contract between me and the EA. If someone moved out, I was under no obligation to stay with the agency to find a new tenant. If I wanted to, I could dump them, do all the leg work myself, and save myself the finders fee. )
Once the tenant moved in, they took either an 8%, 10% or 15% cut of the monthly rent, depending on how involved they were in managing the property. They had 3 different tiers of management on offer. For example, if I took care of all maintenance issues with the house, I'd be on the 8% plan. If they did, I'd be on the 15% one. You may want to give some of them a call, and get some quotes before you presume that 50 quid will cover it per month. One thing that they will do for free is come over to your apt, and give you a free valuation of what they think you will be able to get for it per month. (They did for me anyway.) They will also give you a headsup on things that you may have to do to the apt to make it rentable legally. For example, in my house there were several things that were deemed to be a fire hazard. I would have had to change them before they would agree to take the house on as one of "their" properties, lest they be sued if the you know what ever hit the fan. If your apt is newish, you are probably ok on that score, but it can't hurt to get a free professional opinion. Best of luck to you !